I just started playing Taric....
Yesterday I just started spamming playing Taric (Yeah he still exists). The results are in the link.
Taric seriously has lots of potential for competitive play if he gets a few changes that could make him (more) viable.
One buff I highly recommend is the same one Rammus got. The one where Rammus would use his Q and instantly turn off his W. They changed that so it doesn't turn off instantly, but turns off 1 second after. I think Taric's Shatter (W) that gives bonus armor should persist through cooldown, or atleast last a second or two after using it. At the moment, using shatter removes the bonus armor buff to him and his nearby teammates that he gets from his W. His R could have a little bit more damage range.
Other than that he is a very viable champion, in my experience.