Hmm.. The Top 5 Powergamer Characters -or- the Top 5 RPing Characters? I'm not a powergamer, so I'll list ones I think are the best to play for RPing purposes:

1. Beast Master
2. Assassin
3. Beserker
4. Jester
5. Skald

Although Bards are considered to be on top of the 'Worthless List', all 3 Kits are actually very fun to role-play with. Beast Master is a challenging class mixed in with excellent role-playing capabilities. Power gaming brings the game to an end really fast, but if you role-play instead, it can be very exciting.

1.Fighter/Assassin (play evil and you have more roleplaying than most other characters)
2.Kensai (Kensai mages kinda dilute the raw power you get)
3.Sorceror
4.Inquisitor(dispel magic comes in useful, as does Carsomyr)
5.Beserker (enrage!)

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Why?