It's a certain type of humor Jake. Just like British humor is it's own kind of thing.
Personally, I think all British comedys aside from Monty Python are absolute trash and not in the least bit funny, but thats because I don't enjoy British comedy.
Superbad is hilarious if you're a fan of things like "The 40 Year Old Virgin", "Knocked Up", or Family Guy. It's very irreverent humor. Not witty Woody Allen humor.
Superbad is absolutely hilarious, but thats because I enjoy that type of humor.