I think it's just the way the trailer's cut that is making it look like that...plus the music seems lifted out of MiB. I still have high hopes. The casting is all perfect. I think we'll see lots of conventionally lame trailers since british humor has a hard time having major mainstream success in the states and a film needs that in order to cover its costs.
Anyway, I think the movie will be good based on Blur's Coffee and TV video alone (done by Hammer & Tongs).