I'm a big Frost Peggy fan and love Spaced, Hot Fuzz and of course the legendary SOTD. It's worth noting that these were all directed by Edgar Wright with their creative input.
I saw Paul at the cinema and, like everyone else expected more of the same. Unfortunately what followed was fart jokes and very flat humour, the Alien might as well have been a pixie for all the difference it made.
This was their first outing without Edgar Wright and they admitted (on Kermode Radio 5) that they had to sacrifice creative input to satisfy the money men, it cost something like $50M.
Very disappointing, worth renting but not buying.