Actually, most bosses in this game are kind of easy... The first time I played it, I overestimated the gargoyles and went Rocky on the goons, levelling up around that area before I even got to them.
Iron Golem was the same... I was expecting insanely fast, hard hitting boss who would make me fall to death easily at the same time, because of how that whole place is set up. How relieved I was to see that it was a giant in a rooftop... I went to town on his legs and the way he fell... Man, that was still a funny, satisfying moment.
Pinwheel was funny. That cool intro, then he died in a couple of combo from the black knight halberd.