Street Fighter X Mega Man, a fan-game supported and released by Capcom for free, has some issues. Users on the Capcom message boards have brought to attention complaints regarding crashes, the inability to save, and other things that could do with improvements.
In reply to these comments, Capcom’s Senior Vice-President, Christian Svensson, says that he’ll bring these issues up with the game’s development group, and that an update patch will be coming to address them in the future.
Additionally, in another thread on the forums, Svensson says that Street Fighter X Mega Man has exceeded his personal expectations of the game. Keep in mind that this is a free game, though, so expectations being exceeded in this particular case may not mean a whole lot.