Commendations as a concept are fine, as part of a ranking up process, terrible. You are hoping that other players remember/are able/can be bothered to award them. No slight to others, the system for awarding them is clunky.
The number of times I’ve been in an activity where one or more players leave without awarding any commendations is growing.
To hit 460, even getting 2 per activity on average requires 230 play throughs of Gambit/Vanguard/Crucible and that is just to go from rank 6 to rank 7. Who wants to do that every season as this resets every new season?