Played through the first few levels as well, and only one word can decscribe the atmosphere.... Wow.
The opening level is ridiculously awesome.
I had a huge gaping grin on my face as it played out. The cool thing is there are no cutscenes in the game, everything is happening while you control it.
HOWEVER. It's not all gravy.
This game has quite simply, the ugliest, nastiest textures I've ever seen in game up close. From afar, they look great, but up close, uugh, blurfest like you wouldn't believe. Not nearly the graphical showcase I was expecting. Still great, but not mindblowing like I anticipated.
Ratchet & Clank has spoiled me with it's ridiculously clean picture quality at any distance.