User blog comment:Accrepower/Some Champions are left behind./@comment-128.230.202.227-20130207171450

Nasus isn't picked very often solely because he's very vulnerable in lane. He's easily dominated, and is heavily dependent on farm and items.

Renekton is a monster and straight up rocks lanes. I'd imagine that due to his [comparatively] poor scaling into the late game, that's why people don't break out the croc as often as Irelia or Olaf. That said, he's a fucking nightmare and will dump on pretty much any lane matchup.

Xerath is probably in a much better spot now in S3, solely from the Penetration changes. His free 40% MPen is greater than that provided by Void Staff. Stack up a few pen items on him and he will obliterate any group of tightly packed squishies.

Champions haven't gotten really "left behind" so much as the meta shifts and they're not as viable or popular as they once were. I guarantee that you'll see these three champs quite often in the very near future.