It's like the original Metal Gear Solid for Playstation but with batman. The fighting rules including seemingliy countless counter attacks, the animation is great, the main enemies (Bane, Sandman, Poison Ivy, etc.) are crazy and awesome. You can move in stealth using your grappling hook to jump down on some perps, or run in full bore kicking ass.
Definitely recommend this game.
Some screenshots. These are from live gameplay, not cut scenes:
