What's nice about those pads compared to a Genesis/Mega Drive controller is how much more discreet the directions are. In other words, on a standard 3-button Mega Drive controller, you oft times accidentally 'jump' when you meant to just go right. Sega Master System pads are the worst yet. Horrible design IMHO.
Still don't know why Cammy has good luck playing 2 button games on a Sega pad though without using an adapter or patch somewhere... I've only ever been able to use 1-button (B) on my Miggy's. I think that's what some are saying is "strange"...