Upon more playing, the 2 biggest things that stand out to me are these:

1) There is a simple guide for how to negate Teemo. Step 1: buy mercury treads. Step 2: ignore Teemo. It really does turn his shrooms into a complete joke.

2) I miss his old passive. His new passive isn't really a skill. It simply doesn't exist in real game play. But let me tell you how good his old passive was. I am getting chased. I go through brush and out the other side. But I can still see in the brush and the side I entered, for a while. I see the moment they turn around and stop chasing. So I double back and tap them again with a dart and attack, then run back again. It was AMAZING for kiting people, and I would know whether to keep running or to go back and initiate again. Now I lost that ability, and doubling back is incredibly dangerous, never knowing if they are waiting for me in the brush or have stopped the chase. Please just bring back the trail blazer ability.