She is experienced. But in agility. She was trained at a circus and was never truly trained to fight correctly. That's only part of it. People overrate her a lot. Many people consider her the 'superior nonbender'. Just because she knows certain points on the body to basically paralyze people does not mean she is superior to everyone else. She doesn't have any sort of weaponry, and she's not a bender, she doesn't have much besides her own hands. I think the other three are much better. Also, Mai and Suki have much more experience, especially Suki. I don't care if Ty Lee was able to best Katara and Sokka, that was in season 2. Katara wasn't an amazing water bender, she was great, but not amazing. Sokka didn't have his sword back then, he was mostly just comic relief. I know people think Ty Lee is the best, but I'm standing by my decision.
Once again, unpopular opinion, I don't care if my opinions are unpopular, I'm standing by them.

I agree and I dont find her fighting to be impressive either.

Or Ty-Lee. I mean I think people over-hype both of these two. Where as Sokka and Mai are seriously skilled.

and Suki.

None >_< Sokka was trained , Suki was trained , Mai was trained (right? ) , Ty Lee was never said to be trained but she trained acrobatics and knew perfect Chi Blocking , they were all strong and good in some fighting style ...and i'll just say that i was impressed by Ty Lee because not all people can do what she can and know what she does (just like Sokka's sword skills and Mai's knife trowing skills and Suki's martial arts , they all had skills)