I'll chime in with my list.
1. Exar Kun/Revan/Ulic Qel-Droma
2. Exar Kun/Revan/Ulic Qel-Droma
3. Exar Kun/Revan/Ulic Qel-Droma
4. Darth Malgus
5. Hero of Tython/Wrath
6. Hero of Tython/Wrath
7. Tulak Hord
8. Aryn Leneer / Vodo-Siosk Baas
9. Darth Malak
10. Freedon Nadd / Ven Zallow
Key:
"Character name"/"Character name" on multiple lines means they are interchangeable.
"Character name"*Space*/*Space*"Character name" on one line means they are too close to call at the moment.
I'm eager to have that list critiqued, however, mostly for duelists I'm missing. I think the rankings themselves are fairly accurate although if some of my choices can broken down out of tiers and into simple placements that would be preferred.