Corporate dentistry sucks ass, period.
However, having said that, there probably isn't much new grads can do but be used by these dental black eyes, and they know it. Too inexperienced to start a business, too raw in the eyes of many private practitioners for associateships, with a mountain of student loans, most would have no choice but to be used by these scumbags.
My advice is to understand these limitations, use corporate dental as a source of guaranteed salary and experience, and stay no more than two years. Anything beyond that is redundant and harmful., staying too long can also warp the way you think and permanently damage your perception of the proper way to practice dentistry because you will be continuously marinated in the corporate philosophy. I remember when I was working at MyDentist. Every couple weeks they would have a 'dental director' come down from OKC to do study groups, ostensibly to 'learn.' In reality, the dental director simply plays videos like frank spears where they try to brainwash you on how much money you should aim to make per hour. If you really learn to think solely like that, you can't possibly have your patients best interests at heart, which I think is the true long term catalyst for success.