Magic kingdom definitely sucks a bit since you have to do the extra leg from the TTC. The other parks are fine, sometimes they seemed to run more on a schedule according to the bus drivers. Animal kingdom our entire stay picked up on the 15/45 from the park, and I found this to be easier to plan than the randomness of the Disney system. Little bit of an extra walk, but the certainty of departure times made up for it in my opinion.
Overall I would say it was on par with the Disney system, and the busses were obviously the much nicer touring style.