AV31/34 - can't remember which one, broke down on me three weeks in a row, on exactly the same timetabled departure with an engine failure.
RV538 - It's just slow

EV68 - Because I'm sick of the sight of it, and it's ultra rattly destination display
EV71 - The worst bus in the fleet. The squeaking downstairs, the banging, the rattling, the seats with bars going into them go back and forward when sitting on them, as the bars are not tight into the ceiling on virtually every pole, and to top it all of it's slow with a wheezing noise every time it comes to a stop and absolutely zero noise insulation and hardly moves.