From what I've read on IGN, many people were disappointed at the release of XD, primarily due to it being almost identical to Colosseum, except for a few new parts added to the game.
Take a look at the Official IGN Review for XD, which scored only a passable 6.9 out of 10 - in other words, 69 percent
http://cube.ign.com/articles/656/656659p1.html
And read this review of a person who feels like throwing his computer out the window for wasting his money on XD:
http://rr.cube.ign.com/rr/716652/033/033458.html
Lots of us were upset since this
is 2005 and Nintendo has yet to create a Pok