Coming from a G2. I'd say that the G3 is a slight improvement on a phone (G2) that was rock solid, except in battery performance. For that reason, I'd give it a 7. I'm happy with it, but it could have been better if they had waited until the 805 chip was out. At least, that's what the "experts" are saying that the 805 will improve battery performance. So:
9.0
UPDATE 22 July: I answered this too fast. My battery and phone has settled down now after a few days and is noticeably better than the G2. For that reason, I had to come in and change my rating to a 9. I'd still say that signal strength isn't any better than my G2, so not a 10.