If filler can be avoided, avoided it.
Seriously, I loved Bleach (just as an example) when it started, and it was awesome up to the end of the Soul Society arc, but now? It just feels far too....convoluted, shall we say, with....how many is it now? I don't know....seasons' worth of filler, half of which is anime-exclusive. I do like the movies, though, and the current arc of personified Zanpakuto is an interesting concept - just have to see if they do it right. XD
On the other hand, some filler has been VERY BAD. For instance, Pokemon Johto, in my hurable opinion, should be written down as a EUPHEMISM for bad filler.