I don't know if I'd say that. Last year was the year of Part Threes: Spidey 3, Pirates 3, Shrek 3, Ocean's 13, Rush Hour 3..and while those were all a little disappointing, they were still decent movies. The Bourne Ultimatum was awesome. We also had Transformers, Superbad, Juno, Ratatouille and Knocked Up..plus HP and the OotP, There Will Be Blood and No Country For Old Men.
I'm not saying 2007 was better than 2008 (I can't really make a definite decision on that), but I certainly wouldn't say that 08 was much better, if at all.