i finished the game recently as well...
some comments of mine:
i wish there were more puzzles like tomb raider...almost everything was solved by climbing, i wish it had you explore for answers rather than having everything solved in the book, you run into a problem and it happens to be in the book
the cover system needs more polishing, sometimes wont go in to cover and sometimes wont go out of cover
game is a bit easy (i played on hard), its nothing compared to the hard difficulty of cod4...i had plenty of time to try and headshot most of the enemies including the later levels
ak47 is for the most part worthless...handguns seem to do more damage than rifles with the exception of the sniper rifle, but its matched by the revolver and the desert eagle
i do like that the AI tries to dodge your bullets, but when they go for cover, you can take your time and shoot at their limbs but when you go for cover and stick out a bit for a good amount of time, they cant hit you
the last fight was a lot easier than i thought it would be
now for the graphics, i think it looks good save for the texture popping and the plastic look of the characters (but thats more of a peeve of mines, for others it seems to be very acceptable)...some textures look horrible till you give it a few seconds then it loads to something nice looking
the animations are good as well
all in all, its a good game and is a must have for ps3 owners, i would not go so far as giving it GOTY however...IMO, nothing this year will top the COD4 sniper level, that alone will, for me, be a candidate for GOTY (but i will probably give it to super mario galaxy, which i believe is underrated since most people only judge it by the first few galaxies or by its "kiddie" image but im digressing), but im sure others will disagree