Imo, I thought it was really fun, and less hard on your pc than the first one, but it could've done with more free roam capabilities like the first two. I kept feeling like I was being pushed in one direction by the game, something like Prototype would've been cool, make a quarantined area where there are citizens that keep respawning...that you can kill...over and over and over.
Multiplayer is tough though. I suck sooo bad, learning curve is huge. I'm starting to realize that I can't camp in one place the whole time in stealth mode and a sniper in my hand. Been playing multiplayer for about a week....last match I went 1-11.
If you haven't played it yet and might want to, I would definitely recommend renting it, you might really enjoy the eye candy and stuff. Story wise it was...mehh, visuals are beastly though.