No, its because they have genuine issues, where the ADV doesn't really (when compared to those aforementioned classes)
Adv main issues - Morphs need to be tougher/Pistols suck.
Pistols is a weapon issue. Most adv's these days use shotgun, AR, 1he, 2hb, whatever.
Morphs should be better however. But I would say in terms of "gimp" classes, Adv's rank 3rd-5th, behind MA, Agent, And on par with NT, Fixer.