Mine isn't going to be as nicely formatted as Morganator's, and keep in mind mine is a more casual meta, but here it is...
Sliver Overlord...…………………….11-3.....78%
Purphoros, God of the Forge.....8-3...…..72%
Skullbriar, the Walking Grave...15-6.....71%
Karador, Ghost Chieftan………….12-7.....63%
Sidisi, Brood Tyrant................27-23...54% (higher than I thought)
Edgar Markov...……………………...3-4......42%
Animar, Soul of Elements………..5-8......38%
Overall...………………………………….82-54....60%
Skullbriar is 11-0 in 1v1 but only 4-6 in multiplayer games, it just makes itself too big a target to survive taking out 3 or more opponents and usually once I take out one or more I become just have too much of a target to take out the remaining players. Sidisi has became a game of archenemy but I'm still able to take out 1 or 2 opponents before going out. The deck has never finished worse than 3rd. Karador is Shadowborn Apostles and holds its own by early explosions. Purphoros I don't play that much, I save it more for play against newer (and I don't know how else to say this) or lesser players.
Sliver Overlord I only play occassionally, it's a decent deck but not one I really enjoy piloting. Animar is one of those commanders that draws hate as soon as people see him so it having the win% it does kind of surprises me. Edgar is same boat as Animar. These are the only decks I have more than 2 or 3 games with.