This was a 4, but in the final dungeon there's a bunch of koopaling bosses in a row, which isn't inherently bad, but the last couple have these timer bombs that mean you have to win in a certain amount of turns or they blow and you die. It's not like they're super hard or anything, but I don't like having the freedom to beat bosses as slowly as I want being taken away from me. I also found the final bosses spinning attack really hard to get the dodge timing right.