I'm under the impression that Taric works best with Draven. His Q is very strong for poking purposes, but I don't Draven is a very good "poke champion" because of it. Because his q is an auto-attack modifier, it only has the range of his auto-attack, 550. Compare this with much stronger pokes, like Ezreal's Q (1100), Kog'Maw's W (630 even at lvl 1), or even champions with simple longer auto-attacks like Caitlyn or Trist (after a few levels). I feel that Draven actually does best in hard engages because his sustained damage, as long as he can catch the axes, is arguably higher than any other AD carries'. To that end, Taric's stun allows for Draven to usually hit 1, possibly 2 Spinning Axes for free, at which point the other champion can either try to stand and fight (and will likely die) or run, at which point Draven is getting free harass.
TL;DR: Champs that have a move with longer range than 550 beat him; supports that have hard CC (stuns/knockups) work well with him; supports that can kite well work well against him (Janna, Nunu, Lulu)