I didn't play the first two, but loved the third. I did play the whole game co-op from start to finish, so I have no clue how good it is single-player.
As a co-op game, it's so good, just so good. I'm going to assume it's kinda the same as the first two though so, you might not like it.
Deus Ex: Human Revolution, The Witcher/The Witcher 2 (The first Witcher being one of the best RPG's this generation IMO, if you can get passed the bad, bad animations), Dragon Age: Origins, Fallout 1 and 2 (3/New Vegas is good too but most people have played those), Titan Quest, for some examples.
It wasn't really the gameplay I hated, I
Mostly hated that they made you do dumb small missions over and over again to earn enough cred or whatever to do real missions. Then when you ran out of cred, you had to do the same little missions again.
Not sure if that is in the third one again.
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