My fav WP7 phone was funny enough, the Mozart; the best device I used was the Focus S. I like the Mozart more because HTC does well with unibody designs and the phone had great potential. I was bitterly disappointed with the camera, its second best feature (loved the design). I have a soft spot for the Focus S because it just worked. All the features did as advertised. No potential was wasted.
HTC's problem is that the market is telling them that we'd rather have a boring design SGS 4, iphone 5, as long as we get good software features and support. A pig wearing a $600 dress will always be an insult to the dress.
It is sad though, because software support has never been HTC's strong suit, and Nokia and Samsung, and even Apple have really exposed this. High Tech Computer needs to remember that the masses want better software support. It is why they should hang their hats on design still AND audio support. Send out updates to tweak the camera constantly too. Send out updates tweaking the audio on the 8X and One (when launched). They've got good hardware out, but just improve software support.