Well Dragonball GT suffers from the same inconsistency as Dragonball or Dragonball Z in that some episodes are godly and some are complete crap. Toei is generally pretty bad at keeping up a certain level of quality and coherence. It also didn't help that the overall styling and coloration in GT was pretty freaking hideous, but that's more my opinion.
Really? I've always found the range between a bad animation day and a god-like one to be a lot smaller in GT. In terms of color, they bother me slightly in that they're either too dark or too bold (Pan's shirt, anyone?).
The Dragon Ball Z/GT series are actually pretty consistent in comparison to some other series. You guys don't even want to lay eyes on Powerpuff Girls Z.