Ya MB Wheels from Discount are horrid, I had a set for my MINI and they bent by looking at them. That was a bad purchasing choice, but at least they cost me hardly anything.
And a better quality wheel shouldn't bend as easy as a wheel with poor quality. Balancing also becomes and issue, especially with gravity cast wheels. I don't know though, I just have a tough time accepting wheels that aren't from a known manufacturer, especially after the MB Wheels horror.
I am not looking for anything racecar worthy, but having something that can take some bumps on Detroit's streets without falling apart or bending like butter is something I really take into consideration. But like I said if they have a TUV, JWL or any other cert they are going to be good enough to run on your car since they were quality checked but a third party organization. Stick with those and you shouldn't have a problem.