best of the series. easily.
1. controls- fantastic, improved over the broken clunkiness of the first 3 games, however can still be clunky when you're trying to do a lot of things at the same time.
2. story- finishes almost every aspect of the story. great story, however several dialogue scenes are boring and unnecessary. the ending has some parts that are cliche, but overall it's satisfying.
3. gameplay/cutscenes- gameplay is amazing, it just works completely through the game, with some very interesting and amazing gameplay sequences at the ends of almost every act. during the end of the game, cutscenes start to take over. you can clear the gameplay of acts 4 and 5 easily within 2 hours on normal mode. however, this doesn't lessen the overall game and the gameplay is still overall amazing. cutscenes are much longer than previous games, but if you watch them you will not be dissapointed.
4. online- very slow and unpolished gameplay, but some people will enjoy this. it's a love or hate thing. this is the only major flaw with the game.
5. graphics- very good, but not the most technically impressive ever.
6. etc- you can run through the whole game without having to buy any weapons or attachments, unlockables are exciting, i really wish this had trophies.