I might be bias since Lee is my fav char, but I really have to feel sorry and the utmost respect for Lee. He's fought off with the best of the best:
Neiji,
Gaara,
Sasuke(ugh.. I really shouldn't include him),
and Boner(Kimimaro).
(OMFG.. I'm not going to include those Sound-tards, Zaku and co., either for the sake of my respect for Lee)
What's sad is that he had lost in all of these match-ups, excluding vs. Sasuke of course. I really hope that in the future, Kishimoto will make him such a badass that he can take down one of these top tiers.
Does anyone else feel the same way?