I think it might be possible and maybe even easy to solo Neverwinter Nights, seeing that you can only have one companion at a time anyway and they're often more trouble to babysit than to just leave them behind. The key to success though (in almost every D&D game) is not to rush in on every encounter, but to calculate risks beforehand and use minor tactics, like luring individual enemies away from large groups before the rest of them spots you and using doorways as bottlenecks to decrease the number of your opponents to 1-3 at a time and prevent being attacked from behind. Personally I favor playing spellcasters who can summon at least one ally at will.

Sorcerers are good when you want to concentrate on offensive magic. You'll get very powerful later on, but you have to avoid melee enemies, so many people say they are tougher to play than fighters. My experience is the other way around though; you just have to make use of your familiar (best choose a melee fighter like a panther) and then summon another animal by spell, and then you have a party of three during low levels, even without choosing one of the NPC companions, and on the higher levels you can blast several enemies at the same time with area-of-effect spells, while fighters are always on their own and have to battle foes one by one. A good compromise, and my favorite class, are clerics; they're overpowered but fun-to-play due to their versatility. They allow you to be a party of two (you and your summoned ally - at low levels an animal, at higher levels an elemental, celestial or demon), use weapons and armor and engage in melee combat, but also cast offensive spells, cast buffs, heal yourself and your allies, turn and destroy undeads by ability. Along with the powerful items you'll find in NWN, that makes them tough opponents for your foes. Just remember what I wrote above and don't think you can take on a whole army diablo-style. Below the superficial real-time hacking and slashing it's still a (semi turn-based) tactical D&D game.

That being said, in my personal opinion the official campaign isn't really worth playing through; too long, too much hack and slash, boring and at times ridiculous story. I haven't played it myself yet, but you could try starting at lvl 1 with Shadows of Undrentide to learn the ropes, just so that you won't be overwhelmed when you play its high-level sequel, Hordes of the Underdark, which is the best of the three official campaigns. Or look for good community modules instead.

Baldur's Gate isn't that hard if you're a little bit familiar with D&D, it just features a few tough encounters (dragons and liches mostly) that you can either avoid or cheat your way through if they get too tedious to be fun. And I agree, don't start with a mage. You might not even survive the tutorial with a mage, because it's so terribly balanced for low level mages (the tutorial has you fight a melee opponent in a small room without any space to run away and without any time to prepare; perfect recipe for failure, if you're playing a weak mage with max. 4 hitpoints who either dies or loses concentration on the first hit - well done, Bioware! :P).

I’d say lifeless worlds are a consistent Bioware problem yes. It generally isn't a priority, as they prefer to dedicate resources elsewhere. Most of their recent games don’t have NPC schedules, day/night cycles that affect something, or anything to give you a sense that the world doesn't revolve around you. Compounding that is their insistence on setting games in major cities rather than wilder low population lands, so we end up with these vast urban markets with only the occasional NPC rooted to the spot to break up how empty it is (Man, the economy really hit this place hard!). Oh they might throw in a couple of peasants walking a patrol path, but that’s about it. Look up some screenshots for Denerim and recall its supposed to be THE market for an entire continent.

I've been wondering why Dragon Age: Origins and Dragon Age 2 bothers me in this regard, and something like Pillars of Eternity or Baldur’s Gate (ignoring the day/night cycles for a moment) doesn't. Maybe it’s something to do with the camera and how that affects both your perception of the world and the design. In the latter games level design is a lot tighter. The birds-eye camera doesn't rotate and the environments are 2D painted backdrops, so the detail looks flawless within a smaller contained area and traversing the map is quicker. Transitioning to 3D brings a number of issues.

Maybe but not to sound too much like a dick, but neverwinter nights even as difficult as it is, is possible to beat for someone who is not familiar.

However, being as the d and d gold box games just got released-do you really think that anyone that isnt familiar with those games, doesnt have nostalgia will be able to get past an hour of that crap?

The only one I beat was Dungeon but dungeon hack is a roguelike and not a rpg and not turnbased. But the others were terribly difficult and I dont believe that 5 people just 5 people who arent familiar with the rules and have never played a game like pool of radiance before. They wont make it past 5 hours and if they do they will be more frustrated than ever.

Pool of radiance is better on Nes because they got rid of the weight problem and everyone can pool money.

The only games IMO that are worth playing and are possible to beat in forgotten realms d and d universe are-

Baldurs Gate series

So basically

Pool of Radiance Series
Gateway Savage frontier series
Krynn Series
Eye of the beholder series
Menzobarrazan
Ravenloft
Dark Sun

I think I got all them. All those games will be impossible for anyone unfamiliar with those games or has played a game from that time. Without automap features, difficulty that pummels you in the beginning, and also the fact that you could play all these games free on dj old games without paying gog.

Tell me why should anyone buy these from gog?

Starting to sound a lot like what i noticed early on trying to play Jade Empire... and in turn also how Jade Empire felt like Kotor...

Because maybe the site you mention is not legit in allowing one to play these games?

And they are not all that difficult. Many people remember 1st and 2nd edition D&D and its rules. It is not so arcane and isn't all that very much different from 3rd edition.

But back to the OP's topic. I think it's also something inherent to RPGs in general. They tend to be long games and as such there usually is that sense toward the middle of games in this genre of "sameness" and repetition. There is only so much one variation one can add to a game.