You really can't see the potential?
Alright then. Let's see.
He has great scaling on his Auto attacks (they do some damage late game!) and they also slow! BArd is great at chasing fleeing enemies and also fairly good at peeling against the current tanks. Did I mention how good his AA animation is. It makes trading in lane beautiful.
He has a fairly low cooldown stun. The ability to stun two people ever few seconds is amazing.
His W is probably better for the in combat speed boost... But what an in combat speed boost. Alright... so this one isn't great, but it still has potential. It can give your jungler an extra camp, which can be important early game and save an ally from a gank (50% MS!). How does it do as a ward? I can't remember for some reason.
His portal is awesome - ROTATIONS. Brilliant for chasing (you can cut off an exit path) and you can do fairly good baits. It is also a near guaranteed stun on a chasing enemy when you get good with him.
And his ultimate. Yes, you can fuck up big time, but you can also set up amazing plays. You can put it in a fleeing enemies path to cut off their escape at the end of a fight, you can lock half the enemy team in place, giving you two small, easy teamfights rather than one big one. You can lock both Nexus towers or an inhibitor tower for diving, You can buy time for your team to reach Dragon or Baron so that you can contest it.
Bard is a mass of potential - I just don't think many people have mastered him yet.
No-one ever will at my ELO, I think...