Wasn’t as good, imo.
The first one was maybe weird because it was still setting itself up. The second one was indeed a filler and the worst of the series (but nowhere near MMBN4-level bad). The third one on the other hand is easily a masterpiece beating MMBN6.
Shoot em up: Iridion 2
RPG: Mega Man Battle Network series
Racing: just Mario Kart Super Circuit lol