Many people seem to have a big beef with the
Dreamcast's standard
pad.
For reference, here's a description:
around the size of a CD case; strangely ergonomic
four face buttons; two analogue triggers; analogue thumbpad; digital d-pad; start button
slots for two VMU units and window on the face, to expose the front unit's screen.
Admittedly, it ain't that wonderful for fighting games. Otherwise, on a subjective level, I've not had any real gripes with it.