I like most of the mechanics of the game, like the little bit of RPG, driving, mixing into the FPS environment we all love.
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However, gameplay-wise, the ending is really bad, the progression was great before you enter the subway town (3rd / final town). Also, it seems like the headshots aren't very rewarding... You can empty a clip of "steel tip" AR rounds into a thug and he just walk it off like nothing... Invisibility frame maybe?? WingSticks are the way to go in harder difficulty... It is very confusing when you can't kill someone with two shotgun shells to the head... but obviously, a wingstick would just one hit ko him... The ending... really? It's like the author died and someone from another country picked it up and finished it... with two lines...
I played the PC version, and frankly, like a lot of modern games, it's like freaking unplayable... aim assists is always on, next to none (aka console graphics settings) available, and with the original release of the game... just try using the mouse in the menu... you will feel as if you just pirated the developer's pre-release version. It's somewhat like the BF3 beta...
BTW, it isn't that hard to get work arounds, like enabling consoles to fix some of the problems, but then you would lose the achievements...
I can't say all other games are release perfectly... but look at COD6, 7, Crysis, warhead, 2, and dragon age 2... They don't seem to have that much problem... IN COMPARISON WITH SinglePlayer EXPERIENCE...