Most of the bosses in the NES Mario games just aren't particularly imposing. Sure, there was Koopa (or his imitators or whatever) in the first game, but those fireballs moved so slooowly, and all you had to do was get behind him. The Koopa in the third game don't do much better, and are generally the easiest of whichever level they inhabit. This is not a problem that SMB2 is burdened with.
|A mouse? Who throws bombs?? WHILE WEARING SUNGLASSES!?!? Hell, yeah!|
|That's another matter entirely.|