"Simply because each and every time you.."

The best way to have an opinion of something is the simple expedient of compareing with something else. For instance I compare Vue with Poser, Daz and Cinema 4D VRay renders.

Edit: And I forgot to say, Vue is by far the slowest for large resolutions. Not 2x slower or 3x slower but hundreds of times slower, in short there is something wrong with it.