they have about 500 games out (last tv-ad shows that, at least). and they have tons of great games (wich i yet have to find on any other platform).
addicting? ohh yes.
yeah, and the graphics are just.. different.. natural.. something i miss on xbox till today. on ps2, too.
yes, the gc uses dvd's in the small format, and reverse burned. to be able to actually read anything, you have to reverse the rotation direction of your dvd-rom/dvd-rw. and i guess the laser too weak to read burned dvd's (just like our dvd player.. shit).
they have about 1gb of data on it. more than enough for games. except for epic unreal software:D but they are just crazy anyways.