I'm not.
-Marty wrote unique and iconic melodies. Michael Salvatori is a good composer who is obviously familiar with Marty's MO, having worked on those scores with him. However, the majority of what I've heard from the expansions isn't on par with Marty's original Destiny motifs or his Halo work, as it lacks memorable themes with true staying power. The Reef had good background music, Crota, Skolas and Oryx's themes were solid, Rise of Iron had good background tracks, there's some well done menu music, and all of that amounts to a dozen or so songs out of over a hundred. That's hardly the same quality ratio.
-Destiny's level design was horrendous. Every map was bogged down because they were anchored to Control, and most of them were full of obnoxious chokepoints and easily abusable thresholds that did not facilitate its competitive game modes. Halo is a very different game, but it did multi gametypes per map way better on account of not being restricted to the 3 lane formula. Fortunately, Bungie seems to be changing this by designing for a smaller, universal player count. Midtown from D2 is as generic and safe as 3 lanes come, but at least it's a good design.
-I don't have time to explain why the storytelling used to be better, but I don't have to ¯\_(ツ
_/¯
-As for community updates, one word: DeeJ (who ends up typing many unnecessary words)
I guess the Bungie koolaid still tastes good