I do not have direct experience with the G2 but I had a good deal on a G1 kit and went for it thinking I would eventually swap the G1 body for a G2 because of all the bad mouthing the G1 seems to get on the internet.
Six months later, I still have the G1. After the first two rolls I'm completely comfortable with the focusing of the G1. I shoot my young children primarily, and the G1 does not have a problem even with that tricky subject matter. The G90 was part of the kit and while I thought I would rarely use it (both because I prefer wides and because users claimed the G1 focuses it unreliably) I've grown to really like it and I've not had any issues whatsoever focusing it.
One modification I made was to take the camera to my local tech and asked him to tighten the focus wheel so it offers more resistance. BIG IMPROVEMENT! I now use manual focus much more confidently, especially with the amazing G28, which makes it is easy to zone focus.
In short, given the lighter weight, smaller size, and performance of the G1 I think I'll hang on to it for quite a bit longer. Selling it for a couple of hundred dollars seems hardly worth it for such a capable camera.
As everybody has stated before, this would be a perfect system if the viewfinder were larger and the lenses showed depth of field scales.