"The game does have some downloadable content now, but I think its fair to say that it could have been included with the game...not held back a short while and then added on after, seems a little unfair to me. Also, the game has perhaps the toughest achievements I can imagine for a game like this. I can say that its highly unlikely that I or most will get the full 200 points here.
Mega Man 9 is a lot of things...it's great, it's fun and it's annoyingly difficult. It hasn't had the Bionic Commando Rearmed treatment, so it looks pretty bad for an XBLA title. Having said that, it retains its classic look by doing so. All in all, Mega Man 9 is a solid game and one you should try, just don't expect it to be easy."