I've had extensive experience of both legacy and low cost both as a pax and with work and hear very few complaints of being 'bussed'. Occasionally the organisation of the buses has come in for criticism but the actual process of getting on a bus (the poor souls) rarely in my experience, attracts many complaints.
Of course, many on these forums believe that full service is the holy grail and that it is the LCC's should settle for less. Those truly in the know will tell you that LCC's are often every bit demanding in their stipulations than their legacy counterparts. Their requirements may differ sometimes but nevertheless they are demanding.