I dunno, I don't find it too useless. I just don't see it as one of those features you should be sitting down, staring at thinking "THIS IS A FEATURE! I MUST ACKNOWLEDGE ITS EXISTENCE FURTHER MORE!", but rather get to the end and 'oh, hey window pop up. Yeah sure that person played well.', or then go out of the dungeon and then look at your commendation 'awesome i got commended woo' then close the window to forget about it until next time.

If you're aiming right for the Golden Magitek then of course you're going to have a bad time because asking, begging, or just plain sucking up for commendations are transparent and you'll have people more likely to down vote you if a system existed.