I've played all of the Elder Scrolls based games on the PC.
The two original TES games are the best IMO. They were practically first person realtime roguelikes, with heavy emphasis on good character building and some mighty deep dungeons. Arena established everything, it was very hard and satisfying, while Daggerfall improved on every aspect, and as far as I see it has the very best stat/skill system of any RPG to date. Morrowind took a swing for the worse as far as gameplay went. While the game felt more personal it was to... brown.
The NPC's was stocky, always standing in place, constantly pacing in a small area, compared to Daggerfalls 750.000 NPC's, that was always walking around, and went indoors at night. Morrowinds quests was alright, and while the lore was severly butchered from DF, it still had fairly good story telling, and the way non-mainquest quests were presented was a lot better.
Oblivion improved a bit on the gameplay as far as I see it, and while the enviroment is a bit repetetive I still find it to be a bit more attractive, though boring compared to Morrowind. I also much more prefer the uncanny valley, than the mindless pacers. The storytellind and lore was further butchered, but I wasn't really surprised actually. I also liked the dungeons a lot more, those in Morrowind was short and boring, usually not having anything much interesting, and they were also few, compared to Oblivion's. Still doesn't beat Daggerfalls 3-4+ hours dungeons though.
The Elder Scrolls Legends: Battlespire is also good, though one of the hardest games I've ever played. Still haven't finished it, but regardless I would recommend it.
The Elder Scrolls Adventures: Redguard I've just barely touched, but from what I've played of it, it felt really good. Getting it running today can be a bit difficult. I purchased a application called Glidos for $10, and used that in combination with another application called VDos32, which got it running quite well, though I couldn't get the music working at all.
I love every game in the series, and I still play all of them from time to time. It's probably my favorite game series of all.
In case you didn't know, you can get the first Elder Scrolls, Arena, for free at the official website (www.elderscrolls.com), and I would highly recommend anyone who likes old-school RPG's to try it.
Post edited January 11, 2009 by sheepdragon