sonic actually did really well on the gamecube. there weren't any exclusive games for the machine, but it was the first sign that the audiences aligned in a big way.
sonic adventure 2 battle - 1.3m
mega collection - 1.1m
sonic adventure dx - 700k
as for the rest of the point, i think that the gamecube actually did whatever it did largely because of those games. without them, the system would probably be doing what the wii u is doing right now, except maybe a bit better because it was considerably less expensive.
Wow, I'm dumb/forgetful.
I don't know why, but my mind immediately jumped from 2D sonic to 2006 sonic. There was also Sonic Heroes, wonder how that did.
Yeah, I think those games contributed to the GC's numbers. I also think those games weren't seen as very good in the consumer's minds (I, on the other hand, really liked Sunshine and WW). I'm just curious if that had an impact.