I agree with this, haven't seen any real solid victories for Vader that put him on this level. Beating fodder characters who's best achievement is managing some parity with the lowleist of fodder doesn't put him on mace's level either. His other feats - stalemating an old man and loosing to a novice don't mark him that well either.
So your argument is that Vader could battle randoms, in an order that is specifically noted to have degraded in Lightsaber combat -- and as per Mace Windu in attack of the clones, have diminished Force abilities that likely only get worse after the events of Revenge of the Sith? These are feats that aren't even scratching the likes of the Jedi Exile. Damn hope that Vader would improve given that Roan Shrine described his technique as a series of clunky vertical strikes. Not seeing anything that puts him on Windu's level though.
Originally posted by chingchangwalla
Mace very convincingly.
This. Vader, with all of his hype, was suppose to be stronger in Rebels. It's true, that he has no equals there at this moment, but he was unable to stomp Tano after all. Which he should do, on DS nexus.
Maul gave Ahsoka a good fight, and then was stomped by fodder. Another fodders, the Inquisitors, were able to hold their own against her.
Even old, rusty Ben Kenobi (he is, until it wont be stated otherwise) held his own against him quite comfortably.
So, there is nothing at this moment, that would suggest, that Vader might be at least Mace's equal.