I just got the game last night. I just finished the truck jumping level. Overall I like the game. I'll break it down. Note that I never played the first game.
Pros:
1) Great graphics
2) Great story
3) Great banter
4) Great controls (with the exception of the camera being not entirely under your control in areas where it would be nice to see what is around you).
5) Overall great job with the imersion
6) Great cutscenes and voice actors.
7) I love the variety and type of weapons
8) I love the perceived scarcity of weapons (even if they common ones are not scarce). It pushes the action and makes the combat feel urgent.
9) I love how the AI will try to corner you and grenade you. I mean I would if I was them.
10) I like the melee and stealth kill gameplay and animations.
11) The escapes, they are fun and make the game feel more like a movie.
12) Your AI buddy won't go kill himself and force you to start over. This was simply amazing to me. He is almost useful.
Now on to my cons
1) Psychic AI. I hate that the AI will know where you are at with seemingly no intel. Numerous times I can point a gun at the back of a bad guys skull to have him spin around and yell "There he is!". Or the tank that follows you with pin point psychic precision, even shooting right into buildings with no possible eyes telling them where you are. The chopper as well, with it's crazy ability to follow you inside buildings and be right at the right place at the right time
.
2) Lack of ammo for the fun guns. Maybe I'd like to use a shotgun for more then 2 seconds. Why are all the good guns so ammo scares compared to ak-47's and 9mm pistols. For that matter, why is the bad guys obviously crazy funded army (I mean he has thousands of troops) somehow so inconsistently armed. I'd want them to use 1 pistol and 1 rifle for the most part. It would suck to have to stock, .45, 9mm, .50, 7.62, 5.56/.223, .44mag, etc for your normal day to day troops just so they could have a selection. I hated finding cool WW2 weapons to have to abandon them just a few minutes later to go back to yet another AK-47.
3) Unrealistic and inconstant troops. Shoot a light colored soldier in the head, and he dies (as he should). Shoot a dark colored soldier in the head and his hat pops off and he keeps coming. I'm sorry, taking a 7.52 round to the head will put you down, bullet proof or not. The shotgun guns even more annoying, you have to shoot them in the face, then shoot them in the face after their mask comes off? Where on the planet did he find that many humans who were that tough? Further more, why does that toughness suddenly go away if I just toss them over my back or nut punch them? He can take a 9mm to the face but not a 5 foot fall on his back? Why can I pick up weapons from these guys, but the idea of a vest off their corpse is too far fetched? It just takes away from the immersion.
4) Inconsistant climbing materials. Seriously, what is climbable just doesn't always stand out. I've had to fall to my death a few times because something looked just like something you could climb a few scenes before.
5) Inconsistant cover/barriers. Sometimes you can use it, sometimes you can't. Sometimes you can jump over it, sometimes you can't. Especially in the train yard, using a small 2 foot high rail as a barrier just didn't make any sense. I can't walk that way because a 6 inch pole 2 foot off the ground is in my way? I can climb on the roof of shack a, but shack b which is shorter is unclimbable? Just bothers me.
6) Lack of direction. I hate how the game assumes you know where to go. Often your character will say "Follow me" yet you have no idea where the devs wanted you to run to next. Makes for a dying feast as you try not to use your head to beat the fight, but to figure out what the devs wanted you to do to beat the fight. It's locked on rails so much that it goes from stupid hard to stupid easy once you do it the only one way that will work.
7) This goes against what I said above, but you can't kill your partners. I've grenaded them, shot them with rocket launchers, shotguns, etc. They just don't die. While this is nice at times, and they should be tough to kill so I'm not dependent on their stupidity, I should be punished for putting 3 clips of AK ammo in my partner's face.
Overall, the game is good. I'm not sure it was worth 60.00. I should of rented it. I'm not sure if the multiplayer will hold my interest. Time will tell. I hope to finish the game tonight.