He's great against melee champions without gap closers. It's hilarious how well his poison counters Garen's Passive.
Originally Posted by Samizul
I try to take teemo top lane against bruisers that don't have a gapcloser and are susceptible to slows. So I wouldn't play him against Olaf, Jayce, or Wu-Kong, but he's a great counter to someone like Darius, Malphite, or Singed. I tend to build straight for Nashor's Tooth, getting the AP items first to make my last hitting easier. Then I'll usually go for Rabadon's, relying on cleverly placed shrooms and my speed boost to counter my squishiness.
I hope you realize that Darius' pull range is higher than Teemo's AA. The best you can do is bait it.
But anyone whose played Darius can tell you, it's a lot easier to pull Teemo in than it is for Teemo to bait it. Waiting for Teemo's AA-animation to show you he's attacking you gives you a nigh 100% chance of pulling him in. The attack animation prevents Teemo from running away.
And Blinding Darius doesn't do a thing. He'll still apply bleed stacks, and his crippling strike will still cripple Teemo.
If you want to deal with Darius using a ranged champion, Kayle or some other ranged champion with similar AA-range is better.