We stayed there in Sept and I was very worried about the buses after reading so much about them. We didn't have that much trouble.
We always went to the main depot. We only had to stand once (well dh did) and that was on the way back from MK in the rain.
We were travelling with myself, dh and 4 children (4.5 yo, 3.5 yo, 2 yo and infant) I had the infant in a front carrier and we had 2 umbrella strollers with us that dh folded and carried.
However, we did let the first bus go a couple of times, so we could be the first people on the next bus.
I loved the POR and the bus service would not prevent me from staying there again.