I don't know, in my experience, Reddit is much more rife with low-quality posting and bandwagoning than moderator abuse. It happens on rare occasions, but most accusations of moderator abuse I've seen have turned out to be nothing more than some first-world anarchists trying to stick it to the man and a bunch of other people bandwagoning on. Meanwhile, most subreddits with more than 10k posters are just awful because it's so hard for moderators to actually moderate the community (see, for example, all the true* subreddits that have sprung up just to create less popular versions of popular subs).