Just finished it myself.
Endgame spoilers, big ones.
Dissapointed with the ending. Really felt under-fleshed, like they couldn't get all the peices of the property, and the drugs and everything else to fit just as neatly as they would have liked, so they left it as is. The shootout in the sewers was underwhelming as well, could have done a LOT more with that. Coles death was also a bit pants, and a fairly obvious "Maybe he's not dead!!" Thread starter on forums.
Also, pissed off that Ray is still alive, that cocksucker needs to be 6ft under.
Of all your partners, Herschel was the best, felt like he came alive when with Phelps, would have been nice to have had that expanded on.
Overall its a really, really great game, just deserved a large, cinematic ending, which this game didnt deliver, unfortunately.
But, yeah, those of you who havent yet, go buy it. Seriously.