Commendations are funny sometimes.
Some instances will be a cakewalk and I'll hardly have to heal anyone. My 2 year old brother could have healed that group and I still get multiple commendations.
Then there are instances where it's a total hate management nightmare but I still manage to keep everyone alive with well timed heals and cc. I feel like I should have been given the academy award for best healer ever but I get zero commendations. Go figure.