Man, I feel Ranked is different. I've done much better as a tank on Ranked solo queue than in Normal. Shen is always banned, so I go Alistair, when Shen isn't banned.
First game as Shen in solo Ranked was 8/0/23 (pretty much steamrolled them) and second game (now as Alistair) was a 1/6/8, if I'm not mistaken, with us finishing the game by the 25 minute mark with a VICTORIOUS PUSH AFTER AN ACE. Alistair's ult is awesome for towerrape. :') So, yeah, dem tanks are pretty good so far.