I personally like QQ Express for the price and the various side dishes they offer, while I understand there are some people who hate QQ because they think foods here are unhealthy, not authentic Chinese foods. Just keep in mind that this store is comparable to Panda Express. QQ's just a bit cheaper, and I believe QQ gives you more amount.
I prefer fried noodles because their fried rice never have the unique smoky taste that you get from authentic Chinese fried rice. Also the rice is very dry. However, side dishes are generally good. My favorite is meat ball and peanut butter chicken.
Not a lot of people know this, they also do hot pot and it's $10 per person. The amount of meats and other ingredients you get is good enough. But when the store is super busy that it's packed with people, especially during lunch time and dinner, don't expect to order hot pot because they will probably reject it.
If you value price more than the quality, QQ Express is your choice.