My Gf and I saw it last night (BIG MISTAKE!! FRIDAY KIDDIES!!) but even with that we thought it was very good. I complained to the theater about the kids and maybe they'll give us tickets to see it again.
As with LOTR, KK was a little slow in the beginning but picked up the pace as the movie progressed. I'm planning on getting the DVD when it comes out. The special effects were awsome especially Kong. I think I could even smell him he looked that real. Oh, wait, that must have been the man sitting behind me.