Weren't there just about as many bosses as Castlevania I?
Nah, Castlevania 1 features a boss at the end of each level (six total), and two bosses at the final one (so seven total, in the entire game). Unless you were talking about the MSX game.
Castlevania 2 features, what, three bosses? Maybe even two. I don't quite remember. Dracula, the crying mask and ... I
think there's one more, but I'm not sure.