On a jp server it's actually hard to choose; mostly everyone plays well. I'll normally give it to either the tank or heals by default. But if by the off chance the tank is bad (i.e. a paladin that doesn't use shield oath and I steal agro on blm with thunder) or a healer that doesn't heal, then yes I'll give it to a dps.

Interestingly I get a lot of commendations when playing summoner. I don't feel like I really do anything special on it either.