Any group would benefit more from extra buffs cycled from avatar than they are gonna get from your melee.
I'd just want to point out that there are plenty of group combinations that wouldn't benefit more from buffs. It is up to the party leader to be sane enough to make parties that work with a Summoner. Just how you can't just pick random jobs for a COR party.

I personally tend to end up in mage/mule/leftover parties. These usually only benefit from like 1 ward, or there are 2 people benefitting from hastega and 2 people benefitting from MAB and I just say "screw this, I'm not putting 50 MP per person to make them deal slightly more damage." Either you give me 4+ people wanting buffs, or I'm going to rage only.