I don't know if there's such a thing as "good" filler, but there are filler that "don't bend you over quite as far"

The two fillers before ep 135 are passable (Kakashi's face and the Tea Country arc). Kakashi's face was actually based on a short strip that Kishimoto drew. The Anko and Kurenai arcs were both ok - Anko because she's badass and you get to see Oro and Sasuke briefly, Kurenai because there was decent use of genjutsu which you almost never get to see in the actual storyline. Both of their endings were screwed up as usual, which seems to be the norm for post-Sasuke chase filler. The nano country arc was good because the villians were actually powerful and believable, but the ending was also botched. The fake Lee and Gai one-shot was funny, so watch it if you go for that sort of stuff. The Konoha 11 (where a mysterious trap-user tries to destroy Konoha) was also ok, and the ending was decent. The arc where Naruto and Jiraiya try to sneak into Oro's lair was decent too.

In general, the closer the filler is to ep 135, the better it is. Filler seriously went downhill as time went on and the writers ran out of ideas. Of course, the curry of life/raiga arc was one of the worst, and it starts on ep. 152, so go figure.