I faced a group with one Bard in it back to back and that one Bard killed our entire team just by spamming Heavy Shot Venom and Bards there stuns and interrupts our way overpowered and unlike Melees Bards can sit back and pour on the damage.

Nerfing Summoners only creates another problem groups using 2 Bards to slaughter everyone if you think a Summoner is OP face a group of 2 Bards it'll be stun interrupt bind repeat and rinse then dead