Bard has the worst win rate of all supports...
Fact. I'm not counting supports like Fiddlesticks, Shen, or Kennen, because these champs have other roles they can play and do very well. Support is literally all Bard does, and his performance has been very poor since his release. I think the issue is that when Riot designed Bard, they added way too much counterplay in his kit. His shrines shouldn't be able to be destroyed and he should be allowed to place more of them around the map. He should also be rewarded more for gathering chimes (they grant experience, gold, etc), because when he's off doing this it means he can't be in fights, warding/destroying wards, taking objectives, etc. And when he's gathering them he's usually by himself, which makes him easy prey for junglers (or anyone else roaming around). Finally, I think the stasis from his ult should be instant cast, since stasis is instant with item actives.
http://champion.gg/statistics/#?sortBy=general.winPercent&order=descend