I have a 15 to 1 win loss ratio with Shyvana ranked, or so I did. I virtually never lose with her, I dominate my lane, kill every jungle animal there is, and keep the enemy level 5 while everyone else, even in the bottom lane is level 6 or 7. I always pick up first blood, even when there is an enemy jungler, or when there are consistent ganks. My one loss was because my allies thought it would be funny to troll me.
Well anyways, aside from that, my team got beaten by a warwick. I held my own but my allies couldn't, it seems all you need is a frozen heart, lots of health, and a wits end. I kept him from jungling, got the first blood as usual, and we lost because when we hit the 10 minute mark, he was able to shut down one of my team members resulting in a defeat. Now I have a 15/2 win loss ratio, and something similar had happened on blind pick a few days ago. I believe Warwick is one of the better 3v3 characters if you build him solid tank.