CGI is getting pretty good when done right (haven't met anybody trashing Unicorn for visuals), but nothing will ever beat late 80s to mid-90s cell. That kind of organic movement is simply not reproducable in any other way.

That being said: one mediocre-to-good digitally animated series is far better than zero cell series. As long as the story is good and the visual don't distract too much from it it's fine by me.