User blog comment:Megames1/Grievances With Champions/@comment-4915885-20120621092510/@comment-66.45.166.36-20120621171200

Renekton is a very difficult champion to play well, especially approaching the late game. He is a quintissential tanky dps, you cannot build him carry and you cannot build him tank for the reasons you described. The biggest thing to note is that his damage is going to go way down, which is fine because he is not a carry. In teamfights you should be waiting for a tank to initate, then trying to get to the carries with his dash, and killing them as fast as possible, or forcing them to run. Honestly, the damage from your ult will do crazy damage to the team and keep you alive if they decide to focus you. The active from Youmuu's Ghostblade is really helpful in teamfights where they don't decide to focus you, but you should never rush full on youmuu's, because you need to balance survivability with damage.

The other thing about renekton is that he needs a solo lane. There are a few other champions that I know of (Singed, Riven) that will be useless if they do not get their lvl and gold advantages. So the trick to doing well in the late game is farming well in the early and mid game. If you can manage to do that, you go tanky annoying lizard into unstoppable tanky killing machine!