I bought a G1 the week it was released. It's a very good phone in a lot of ways. Not perfect, but as close as is currently available. The app market has been a bit disappointing. There are lots of apps and games, but few are good. This may have something to do with everything still being in "Free-only" mode. Once devs are allowed to charge for their apps, I'm hoping quality will improve.
Bonsai Blast and Metal Storm are the only really slick games I've found, though there are some less polished but enjoyable ones as well.