It was -pretty- good. I'd say it wasn't as strong as GMAOA or GVM. Good effects, as usual. The story, to my mind, wasn't as interesting.
Oh, well. I still want to see it, though I'm thinking that they've pretty much beaten Mechagodzilla to death. The concept's been rehashed what? FIVE times in the series? Six, if you count MOGUERA from G vs. SG. OF the "Millennium" series, my only favorite thus far is GMK. I really just cannot warm up to the G2K suit.
I've got HUGE hopes for GFW.