Not a fan of the lack of skins.
Basically a feature that gets its own slot in the menus, and the only skins are for pre-ordering, and pre-ordering from GameStop. No skins for game completion, no achievements for the Trials of War, and whatever difference there is between the standard weapons and legendary weapons is unnoticeable.
Also, the way the Trials are defined, it basically looks like you get an unlimited amount of time to earn whatever score you want, and then you can choose to complete the actual objective to get that score submitted to the leaderboards. I haven't checked to see if it stops you once the timer hits 15 or whatever the cap is in that particular trial, but according to the objective, the timer objective is only optional for an additional 1k points. That means the leaderboards are useless. This should be an actual timed event where the overall goal is to complete the objective as quickly as possible. The score based goal surrounding it is pretty horrible.