As a hardcore Bard enthusiast with over 950k mastery points, I actually feel pretty comfortable with Bards heal...
Bard is a play maker and should never be on the defensive. Literally, _**all **_the Bard players I know will seldom, if ever, have the time to get all 3 heals fully prepped. It's just a waste of Bard.... If riot really wants to buff Bard again, then they could simply drop the mana cost from 70 to 60.
Bard is fine. I know this will piss people off, but it is true. Bard's W is used mainly for the movement speed anyways and the heals aren't bad if your build is dedicated enough. But regardless, Bard is a support that only his mains excel with. And, as awful as this sounds, it needs to stay that way. I really don't want him to be over buffed and super popular because he will almost certainly end up like Kalista or feel super un-enjoyable when he gets nerfed.