THE GOOD:The fact that it's a Mario game
Creative levels
Classic music
Fun power-ups/items
Just plain fun to play
It has the Koopalings in it.

Just about everything else
THE BAD:
I'm sorry to disappoint you, but I can't see anything bad about this game. It's fun to play, and it has the Koopalings in it, and has plenty of other good stuff. If you call this game bad, then I call Goombas hard to beat. XD.
SUMMARY:
All I can say about this game is that, even to this day, it's still fun to play. I didn't intend to rhyme that. This game is definitely a classic! A classic I tells ya! Ya hear me? A CLASSIC! AND ONE OF THE BEST PARTS ABOUT IT IS THE FACT THAT IT HAS THE KOOPALINGS IN IT! I MEAN SERIOUSLY, WHAT MORE COULD YA POSSIBLY WANT? FINAL WORD, THIS GAME IS AWESOME!