So far it's alright. It's scripted like crazy, but it isn't so much like CoD4 where you're taken from room to room so your ass can be filled with grenades; it just feels like you're always rushing for some reason, you just don't know why. It's a lot less arcade/halo like and more like CoD now. Actually, the CoD influence is sticking out a lot in this game. It's a bit because it still feels like Halo despite being forced to play it like CoD.
Graphically it is also a bit weird. It's really uneven in terms of quality, and even the parts that look good (like the amazing water) get a bit ruined since you have your shimmering gun on the screen. It's actually reminding me a bit of the graphical transition from Halo 1 to Halo 2. So many unnecessary effects in places they don't belong. Still, that whole "SCALE" thing they've been pushing is already apparent and that stuff is impressive, but not so much appealing to look at.
I almost forgot the biggest problem, and one that actually sort of bothers me -- the fov. Normal view is close up enough (and it almost seems like it's on a bias to make it feel higher), but when you sprint it zooms way in to the point where it is just annoying. At least they have sprint in single player now.
If I sound overly negative, well, there are bad parts and despite them I'm enjoying the game. I think it's because it's just the start of the game that I'm feeling this way, because what their doing is another weird thing. In the first two levels you use almost every weapon from the first game (that remained in R2). It's weird considering how long it took to get some of them in Resistance 1. The two new weapons are pretty awesome so far.