Silent hill: Downpour has a much more zombie feel to it than any other previous game.
Interesting aspects of the game -
Weapon durability - weapons break based on their physical components:
Glass bottles/crap items break instantly - great to toss.
Wood breaks fast
Steel takes a while - by that I mean I've never broken a crowbar though I hear it can happen.
Weapon types.. good god. EVERYTHING is a weapon. Rocks. Bricks. Boards. Fishing spears. Frying pans. Bottles. Baseball bats. Golf clubs. Hatchets. Axes. Wrenches. Crowbars. Pickaxes. More axes. Whachoo you know about axes? Long straight pipe. Bent Pipe. Small hammers. Large sledges. Shovels. CHAIRS. Candlesticks. Lamps. I mean.. it's every single room you go into there's 2-3 melee weapons just waiting to be used. Some are multi purpose - axes chop wood barriers, steel blunt objects break locks/smash things, the fish hook can pull down ladders, chairs are great for hitting 2-3 people at once, etc. etc. It's a neat system.
Weapon amounts: you can carry two - basically 1 melee 1 ranged. Ammo is tight. They modeled it after 'the road' - and it shows if you play on hard. REALLY shows. Ammo is incredibly difficult to come by if you're using the pistol with any sort of regularity. Not that it's necessary. I found melee supremely easy.
Dynamic weather affects enemy propogation - i.e. the more it rains, the more enemies come after you. You can break into abandoned houses (some of them) and hole up to avoid the enemies and the weather.
Enemies are very zombie esque. My favorite is the shirtless redneck lookin one. There's a female screamer/flailer type, and a bat demon that are pretty common - fights like the tyrant from the old RE games.
Combat system: Pretty easy. Controls gave me nothing to complain about, shockingly. It's pretty basic stuff without the normally kludgy silent hill 'fighting' system. You can still charge up slightly for a power attack if you want or just combo the hell out of things. Combat is simple enough but fluid - not a 'stand there, take a hit, retaliate, rinse, use healthkit, repeat'. Enemies are random. Done in a way that's interesting and not obnoxious.
*EDIT - Side note: my last SH game was the one before the WII game with the combat system from hell. (SH: Homecoming) and this was VASTLY improved over that one's.
Environment - open world. Fairly linear, but not so linear that you're playing on rails. It rewards exploration with secrets and side quests, which are a new thing. There are lots of very well done 'dynamic tension' things that actually really hit on many different levels of fear for people. It's a pretty coordinated shotgun approach that also is paced in a way to get you to be hit when you're just letting your guard down.
All in all - the best SH game in a long, long, LONG time.