Well, I watched the first three seasons of TCW and the first two episodes of the fourth, and I've pretty much decided to stop watching here.
Yes, the show is better than the PT, with far better writing, acting, and characterization. However, that doesn't save it from mediocrity; the Jedi are still overpowered and lame, the villains are still two-dimensional, there is still too much universe shrinkage, for every good episode there are five lame ones, and beyond Ahsoka and -- surprisingly -- Padmé, I just don't really care about any of the main characters.
Perhaps I'll complete watching TCW one day, but only gradually, with an episode or three every two months or so, 'cause frankly, there are other series I'm far more interested in watching/rewatching than this one.