There are a few for me.
Imp Dig came out just after interest in toys had dropped for me. Probably along with my balls. That figure just has no playability whatsoever. I think we have to put our young childs head on and think 'would I have bought that?'
Imp Dig - no. **** no!
Amanaman - probably because was massive and had a cool stick.
General Nadine - hmmm, probably. To go with Ackbar.
Admiral Ackbar - yes definitely
Ugnaught - too right! Dunno why, but he's kind of cool.
Lobot - everyone bought one
Anakin - maybe, but only if you had everything else
Han Carbonite - yes because it was cool to be able to take him out of the block and to see if it went inside Slave 1
Ewoks - the first few were mysterious being blacked out on the card and all. Not sure whether kids kept buying them after the first few.
Controvertially I don't really like EV9D9 or 8D8. As droid figures go they were pretty boring compared to say DSD, IG88, 4-LOM or 21-B. In fact I would say after the Imp Dig 8D8 comes second most dsliked