Screwed by the Network: Much like with Mega Man Powered Up, the decision to release the game on the PSP, which was having a slow start, pretty much resulted in the game's status as Acclaimed Flop. If the game had been released on any other console, it probably would've done much better.
What Could Have Been: This game was originally going to be the first out of a Continuity Reboot for Mega Man X1-X6 however due to the poor sales of the first game the project was Cut Short, and we'll probably never know how the creators intended to take the series through each storyline.
In addition, while deciding on what to do next with the X series, creator Keiji Inafune was actually torn on whether to make X9 or restart the series with a X1 remake. Obviously, he chose the latter.