5. Assassin
Haven't played one in a while, but these were fun for low level duels. Of course it also meant there was a time where you'd eventually have your Sewer run game streak ruined by someone going hostile with a low level Assassin and trimming down everyone who didn't take her seriously. Act 2 already had those narrow tunnels and lightning bugs, it really didn't need extra headaches for Hardcore mode!
The combat tree was a bit fun but not something I ever really enjoyed keeping up with for more than getting through Normal, but the traps are a blast. It makes for a common and cheap to use class, which is slightly boring, but at the same time you're not struggling if your weapon falls behind. Assassin specific items are pretty cool.
4. Paladin
Never really cared for the Paladin outside of PvP, but I had a blast with my Paladin in PvP circles. Auras were very nice, Zeal and Charge were fine, and of course the Hammer of Justice was pretty much *everything*. It was a dynamic little guy to play in duels, especially when I was in a group that ran 4v4 PvP matches all night long. If we're talking PvM, he might drop down to #6, and given that I don't really do any PvP, I'll probably avoid Paladins for good.
Melee Paladins are definitely gear dependent, but Hammerdin, sheesh, I loved my Pit running MF Hammerdin back in the day.
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Donny: Are they gonna hurt us, Walter?
Walter: No, Donny. These men are cowards.