T:ROTF(Transformers:Revenge of the fallen;not Transformers:Rolling on the floor) also suck to the core.Check rottentomatos.I told my friend not to go,but he said he wanted to watch devastator in action and want to drool over CG.He watched movie and after show was over,he called me and said,"you were right,I now need aspirin."
As of HP6,Critics and fans are praising it.You can't expect to cram entire book into two and half hour movie.I am definately going to watch this movie because I know I will accept the changes they made to books(read all of them,several times.)As of flaws,minor mistakes are later corrected in next editions while flaws are not remaind so because JKR has answered many of them in interviews.Not like Wachowaskies where fans are still *fighting to unanswered questions(including me).
BTW read this superb review of T:ROTF : *blogs.suntimes.com/ebert/2009/06/the_fall_of_the_revengers.html