I dunno about "better," since it's so ambiguous. Immediate flaws I'll point out are funky head hitboxes. Take the monkey with the chainsaw, for example. His scalp is where the head hitbox is. The clot's head hitbox is the chin. Shooting the forehead will result in a body shot :s
Waves are also predictable and doesn't change the variation of monsters spawned.
Other than those, it's pretty damn fun, a helluva lot more diverse in terms of weaponry and tactics as opposed to L4D.