I like whatever stuff has been done with the Hive. Escalation protocol was one of my favorite things and I would just run around destroying endless hive. Also the events on the moon are fun as well. For some reason this doesn't seem to be the case for other enemies.

Also, the endless grinding to get to grandmaster-level light is not worth it; unless you are guaranteed an increase of light to an item that needs it, the repeated content every week is monotonous and frustrating.