I agree too. What's worse is fighting him with only 99 energy, 15 missiles, and 10 power bombs (A.K.A a 1% game). He's a gunship of a freak to take down that way. I did it, but it took me many tries to do that.
Really hate it in a 1% game. Not because Yakuza itself is hard, but because right afterwards, I have to deal with those stupid bugs that kill you in one hit.
I think Nightmare is more fun to fight than Yakuza, its fun to try avoiding his lasers when he screws with gravity, and the fact that you don't have to see Mustard Samus anymore after you fight him gives you somthing to look forward to.