Your Suvivability as a bard is good, but the DPS that comes out is not great. This of course scales with your Attack power.
More Atk-->More DPS--> More healing =Survive longer--> mobs die quicker.
In comparison to other Support roles, Bards have the lowest DPS:Heal ratio, but we do have move buffs to give and give a good tune at the same time
Thats of course if you talking full solo, i wouldnt recommend a full 51 points in Bard for soloing, i would invest some in other DPS souls.
Edit: Apparently we were invincible before Patch 1.1. Bards could heal an Entire raid, without the need of clerics, so i heard.