I need to conduct some brainstorming for an encounter in my coming session. I was hoping for suggestions on any way to make this fight cooler. The group includes a star warlock, a controller wizard, an avenging paladin, a ranger, and a rogue who attacks from stealth to gain combat advantage (obviously, we're playing 4th Edition D&D). The encounter in question takes place in the middle of the night in an inn they've stopped in. What happens is at about 1 in the morning, there is loud banging at the front door. A group of armed men are trying to force their way into the building. Once they've managed to break down the door and cut down the innkeeper, they transform into werewolves and begin tearing through the building, slaughtering all they encounter. I want the encounter to be difficult, chaotic, interesting, and desperate, with a real threat of death or serious injury occurring. However, fighting in some standard inn isn't really an interesting locale for a fight. In addition, a bunch of werewolves, at least as presented in the Monster Vault, don't have any particularly interesting abilities (they have a claw attack, a bite attack, and a club attack. Pretty boring stuff)
My question for the forum is what kind of elements can I introduce into the fight in order to make it a truly memorable encounter? I'll consider any and all ideas put forth, so please don't limit yourselves!