It`s not the quality of the soundsystems it`s the way they are run in most cases.
Sometimes I mow in and adjust the rig myself, it`s shocking the amount of people who own soundsystems yet have no idea how to make them sound good.
Heaps of bass and top, yet no mid range definition is a very common problem with rigs. As well as ridiculously bad limiter and crossover settings inappropriate for the attatched speakers.