Haha don't worry about it, you will learn what is good and what not once you've played a couple of hundred games. Reasons why AP teemo is bad: Your poison dart scaling with AP is horrible, your blind deals nice damage but has a long cooldown and your mushroom damage depends on your opponents stepping on them which is very unreliable. Reasons why AD TF is bad: The teleport is a great tool for ganking but AD characters generally lack damage early game. Late game is much more centered around teamfights where your ultimate isn't very good. Your cards are a great poke when you're AP but they become useless after 10 minutes if you are AD. The stun is good but when you are in a teamfight you want to focus on positioning above all else as an AD carry and the cards are very distracting (for me at least). And TF has a rather short attack range which means he has to expose himself to a lot of spells from the enemy team if he wants to do damage (or stun). www.solomid.net has some excellent guides.