Dash 8 is too low for airbridge/jetway connections. Often parked at remote stands, needing buses, crowded and unpleasant things. And pax can get wet and/or cold getting on and off buses and aircraft.
Dunno about being embarassed as a mere passenger though. My colleagues and I flying Sheds about the place felt a bit self-conscious getting in and out of those ugly old birds. The Airbus is a workplace to feel more proud about! When I'm paxing about, can't say I care as long as the a/c and crew are safe enough. The Dash 8 fits that bill, at least with its UK carrier.