Pretty sure this thread is just going to continue down the exact same path. People ask OP for answers on why she thinks the ratio and commendations truly matter, and she skips or gives an outline of an answer. People respond to the outline, and she skips back a step to simply say it's down to OCD. This is it, this OP is your problem. It's not that you truly believe Commendations to be evidence that you're doing well, as you clearly stated tanks and healers get them just for rolling those roles. What the problem is, if you're not just baiting replies, is that you have OCD about two different meaningless achievements that have different numbers in them.

Have you considered what you're going to do when you finish that dungeon achievements and it no longer tallies that? How will you know how well you're doing then by Commendations? As for the whole tank mounts, even if unsynced was removed from counting towards the achievement, people will just spam AS1, Bismarck and Ravana more, and they are just as easy now as unsynced things.

Just admit to yourself that it's an OCD problem, and realise commendations are given out for random and pointless reasons, and is NOT a record of you doing well.