Supposedly reports of bricking Wii Us are complete bullshit, but the game has caused a system freeze requiring you to unplug the power, which obviously isn't good and could potentially brick the system. I've had stuff like the YouTube app force me to do that so it's not uncommon for the system. Far as anyone knows, there's no proof of MN9 actually rendering anyone's console a paperweight.
Now, the game performs pretty poorly on Wii U. Bad framerate in spots, lengthy load times even after each death, which is really frustrating for a fast-paced action game. Except that there's nothing fast-paced about it and the game only sorta resembles Mega Man on the surface. It's not an offensively bad game, but it sure doesn't live up to its legacy. I got so bored with the first boss stage that I fired up AVGN Adventures just to get some fast shooty–jumpy sidescrolling action going.
I kinda regret not getting it on my PS4 but I wanted to show the little U some extra support and I have a 2TB external HDD on that beast and space is filling up on my PS4's 2TB. I guess it's fine on the U. I'll try to play through the game...maybe. It's kind of dull, but then I thought the PSP Mega Mans were similarly dull.