To answer the original question, it depends on who you ask, and their definition of success. TDO is quite pleased with how things panned out. Burbank, not so much.
TDO didn't want the project and it was forced on them by Burbank. The fact that it isn't driving up the resorts numbers tickles TDO. And they are pleased that it is drawing some of the crowds away from DHS. So TDO is happy.
Burbank, even though they saw the writing on the wall as the IP faded during the lengthy process of getting this thing built, were hoping the "Disney Base" would at least show up for it. Instead, it is a "We'll see it when we go next" type of thing. The Disney fans are excited about it, but not enough to plan an extra trip. I bet the Mickey ride actually drives more traffic to the resort than Pandora did.