Trolls on AVSforum will tell you these things about the vp150 for whatever reason. In fact, they will bash the entire Axiom line calling them harsh, bright, fatiquing. None of these statements are remotely true.
All you have to do is look at the graphs and see they are designed with a FLAT frequency response, and all these statements fall out the window.
Now, the best center is a matching speaker to your left/right mains, however, most people don't want a single m80 standing in front of the screen.
All the professional reviews I've read are positive about the 150's and 100's. I've owned 2 150's and they have been great.