The fact that this game (naturally) lacks the complexity of its sequels is actually a pro, because as I mentioned before it can used as an intro to the series and it's generally a better option if you are looking for a quick match. Another pro (IMHO) is that the sprites are bigger thus adding to the "classic-ness" of the game. Having said that, this game doesn't feature the replayability of its sequels as the campaign is largely plot-less with simple "do this, then do that" objectives without any characters or flavor text involved whatsoever, plus some missions are bugged and/or don't provide much info about their respective objectives. Lastly, the latter missions become increasingly difficult up to the point where they become annoying. TL:DR I recommend this game: 1) As an intro for a series newbie. 2) For a quick campaign. 3) For historical reasons (checking out the roots of one of the greatest turn-based game series).
The game certainly has great atmosphere (OST and locations) and rewards exploration (with early weapon unlocks), but that's where the praise ends. The AI can spot you through your disguise regardless if your actions (even when silently approaching from behind), which gets frustrating quickly. The AI also has a "hive-mind" reaction, which can also be annoying if you are used to more "realistic" approach of modern stealth games, in which you can neutralize allerted enemies before the entire level starts chasing you. Lastly, melee weapons are unreliable as enemies tend to spot you before you enter in the melee weapon's effective range.
The gameplay design is similar to 90s shooters while at the same time it streamlines specific aspects of it to make it more accessible (less mazelike stages, 3 standard keys for each stage etc. ). Regarding weapon variety, it's pretty much the entire arsenal of Doom clones, along with some magical weapons. The music is great and goes well with each corresponding stage. The chance of permadeath on higher difficulties is another great addition for hardcore players. Lastly and more importantly, what amazed me in this game is the character advancement, which is a simplified fusion of Deus Ex's stats and Fallout's perks. All in all, this is an amazing game that is worth for any player looking for a modern adaptation of 90s shooters.
