We stayed at CBR in summer 2011. We never had an issue with transportation, either coming or going to the resort. The longest we waited was probably 15 minutes and again, that was not each time taking the bus.
Keep in mind that where ever you stay, there are going to be people who have had bad experiences with the buses even the deluxe hotels. Maybe out of coincidence what you have heard about CBR buses happened because they just arrived at the busstop at the wrong time, or the bus was totally crowded when they got on, etc. Keep an open mind, because the buses may be absolutely perfect and on time for you.
Once again, I had not issues with the buses at all and we were there during peak season.