Is it really? People say similar things of manhwa and even manga, but I still find plenty that aren't of the type they are complaining it's all they see.
The main flaws of manhua, in my opinion, are that it's trying to catch a ride in the manhwa growth instead of growing on its own and that both the official and unofficial translators are going with a quantity over quality strategy. So manhua is lacking distinctiveness, a community that can promote its gems while having too many distributors that either don't care about promoting its qualities or just have questionable tastes.