I guess ol' Gabe is getting a lil senile.
Wily is bullshit, that is, until you realize it's made trivially easy with Lucas. Since Megaman is essentially Projectiles: The Fighter, you just spam Down B, heal all your damage, find an opening to attack, gain your FS, repeat until all of the Megas are dead, then btfo "Wily" like the bitch he is, just like the games.
Honestly, I found more of the Ace level fights to me more bullshit than the Legend fights, (though this could be because of bias since there a lot more Ace fights than Legends). For example, the one where you fight 1v3 against a team of beam sword wielders on the Kalos Region stage was hair-pulling for me. To me, something like that one was harder than the fight against "The Boss", a Legend Spirit. Because while The Boss was super tough, it was a lot more fair than most. The only hazard being a poison floor, and her defense going up early in the fight. other than that it was just a straight up 1v1 Stamina FD fight. Took every trick I could think of, but finally managed to spike her with Kirby's Up B.
Generally speaking I find that if it's 1v3+ on a Legend or Ace class, you're going to have a bad time.