I really hope sometime soon Microsoft gets out of its monolithic "everything must be Windows 8" funk. Props to the Waypoint dev team for giving us more than we had before, but an app for stats was not the right approach--or at least not the bloated thing we got. Static stats pages are nice!
(And it's a shame that Bungie's moved away from its own clean, simple, and useful approach with the new revision.)
The new bungie.net is still clean and useful, but it has a more modern approach in term of web design. That's a matter of taste.
Waiting to see how we will interact with Destiny using bungie.net to tell if their UI/UX has lost their approach.
For the stats from Halo 4, I still don't understand why 343 Industries didn't use the Halo Waypoint application (at least for Windows Phone). This app is good for Reach, why not put Halo 4 in it ? Something like being able to customize my Spartan from the Halo Waypoint app, make some personnal challenges, looking for maps and gametypes, etc, could have be a large improvement in the Halo experience.
Frankie or David, if you're here, is it possible to contact your UX/UI team to ask them for an interview ? As a designer, it would be a pleasure for me to talk with them like I talk with Sparth when he was in Paris.