Bards have very strong burst damage, and excel at interrupting casts.

One thing to take into account for Bards in PVP, is that their damage dealt is modified depending on their range from the target.

A Bard deals 100% (i.e. normal) damage from about 15/16 yalms away, any closer/further than that and you get an attack reduction; it goes down to about 40% from melee or maximum range.

When fighting Bards, you should try to get in their faces as much as possible; mages sprint towards them and use instant cast spells, Melees jump / shoulder tackle and don't let them escape. If a Bard is defending a flag in frontlines, enter the flag radius and they will have to exit if they want to deal full damage to you.