@Lukas, I don't personally think it's bad. Matter-of-fact, if I were in your shoes, I'd be happy that the backplate was doing such an efficient job at removing heat from the GPU and it's associated components. If you're really concerned, then run HWmonitor (http://filehippo.com/download_hwmonitor/) and check your CPU and GPU temps while playing the same game. But honestly I wouldn't be concerned.
- Rob