I actually agree that none of the bosses in BoI are particularly challenging. If I played the game more often I doubt I would struggle with them at all. The only reason I keep dying in the Mom fight is that I haven't fought her enough times to learn her patterns, but I'm getting much better now.
I fought Peep as a mini-boss in the Womb in my last playthough. I was only on 1 heart and he fucking killed me
