I've heard pretty good things about the new ICE based amps used in products by Wyred4Sound like the mINT and mAMP. Hypex does seem like the class leaders though.
I think Rotel gave it a half hearted effort, got criticised for how it sounded, panicked and went back to what they always did e.g rebadging and refining old designs, slap on a new model number with a new chassis. If you look at the criticism they took, maybe Rotel's typical customer aren't looking for anything new or innovative. Just good sound at an attainable price. I don't think Rotel is a particularly innovative or creative company.
NAD is a good example of modern Hi-Fi with interesting designs and products through utilising the benefits of Class D amplification in different ways. Wyred4Sound did a lot of experimentation with Class D power supply designs when using ICE modules and found it an important ingredient of how these amplifiers can sound.