Haven't played K2 yet, eh? Do me a favor--don't judge it until you've played it at least twice.
As for my first reaction...
Don't remember the first time I played K1. Seriously, I don't. But I remember being amazed by the start of K2, and disappointed by its ending, and then thoroughly confused for a bit, until about a year or two later when I tried to piece together all the cut content and such. Still haven't figured out everything, of course, but I'm getting there.