I think getting "poor" transportation service can occur at any given resort any time of year. Likewise, superb service can occur at any given resort any time of year. Buses break down, monorails need maintenance, as do boats. I'm sure we could find DISers who can report mishaps on any mode of transportation and that it made them late for rope drop, missed an ADR, was uncomfortable waiting for the situation to be resolved.
As I read once on another post...if my family consistently has the luck to arrive at the bus stop 2 minutes before the bus arrives, all week, we're going to walk away saying "this is the best resort for transportation!" However, another family that arrived at the bus stop 3 minutes later than we did (and therefore just missed the bus we took), consistently all week, then had to wait 19-20 minutes for the next bus to come - they are going to complain "we spent so much time waiting for transportation, we'll never stay here again." Everything else being equal, the only difference in experience was simply the lucky/unlucky timing of when each family arrived at the bus stop.
That said, yes there are resorts with multiple options to get to various parks and shorter time spent while actually en-route.