Okay So I aint a big fan of Teemo and I have never played him. After a few games of dying to my little funky friend, I final bought him and wanted to give him a go... See if Teemo is any good or its just the people playing him.

Anyways after 10 Straight games (6 of which were 30 games) I ended up with a rather impressive score and think I may play teemo again.

not bad..

lol not bad at all

Teemo is good for hit and run's and like his name implies, scouting. (Teemo - The Swift Scout)
He can be a monster when fed, but sadly doesn't have much to offer in team fights unless using a tank killing build, and if that's the case, he often get's aimed at first. Don't get me wrong, I do love me some Teemo, if you can get away with him, all the power to you mate.

Teemo is never used at a high level, We don't use him and no other top teams will.. He is strictly kept for scrub Pub Play. Like you said he sucks in team fights and thats a big problem in a team based game. Best 5 Team at the moment would have to be Amumu, Annie/Ryze, Corki, Soraka/Taric and Ashe/Rammus (Depending on Ban draft and other teams decisions)

he's only really used as a scout, to tell the truth, he sucks ashes balls