I have actually been pretty happy with the scope I have on my rifles. It is a Bushnell Banner Dusk and Dawn 6x18x50. For $100, it is hard to beat. It is definitely not a Zeiss or a Swarovski, but not bad.
Bushnell makes good scopes. There are certainly some good scopes under $200. I have certain brands I buy, and then stay away from the low end in those brands. I have been amazed at the quality of Vortex scopes. And will probably look towards them in the future again. Though not the Crossfire series.
Generally if the glass comes from the Philippines, or Japan its good.