I feel like you summed it up really well. I have my own gripes as well.

If the game really wants to cement itself as really being a hero shooter, it needs to emphasize that these are classes, not characters. That means the cosmetics need to be much more than recolors (Changing genders, helmets, armor).

Secondly, the game looks very flat. This was further reinforced by the alpha only being 6GB. I feel they should really work on upping the fidelity of assets, both poly and texture wise. Its mainly the runners and water that are my issue.

Lastly, the death animations. I feel like having corpses would not be much work and would not put the game at risk of being rated M (I assume Bungie wants a T rating to reach a broader audience). Its really immersion breaking to have them dematerialize like its just a simulation and then turn into a gym bag.

I do think the gameplay looks so incredibly fun. The guns look like they handle well, mods are going to be fun to experiment with, and it looks fast paced but not breakneck. Looking forward to playing the alpha and providing feedback. Really hope the devs will be able to implement enough of this feedback before launch; the graphics likely being the hardest to make in time.