they're not bad, they're just so damn mediocre
none of the levels are memorable, they're just a series of easy as shit segments grouped together
the game is super easy, aside from a few really hard parts that are only hard because they have some annoying gimmick associated with them - motion controls, comets etc.
and making you beat the game twice to see the real ending is an actual war crime
I agree with you. The games are gorgeous, but I can't bring myself to slog through the boring parts when I could be playing a different game