I think Centurions look great, as it happens. The concept is weird (power armor for your power armor!) but the execution is good. The models look fantastic in person.
The Dreadknight, yeah--same issue. But that was worse, because the whole thing looked like a baby bjorn.
Anyway, I have no issues with the line overall. I think the banner bearer model they just revealed is a tidbit plain, but otherwise no complaints!