Plenty, sure. Most of them got gunned down by Clone Troopers in ROTS. I think we can safely say that any Jedi who couldn't stand up to some Clone Troopers would fare poorly against even lower-powered Avengers.
Even with Windu on hand, they were slowly getting overwhealmed by the droids in the arena on Geonosis. The Avengers beat more robot armies before 9AM than most people do all day.
Unless you could co-ordinate the entire might of the Star Wars galaxy to somehow attack Earth's Mightiest Heroes simultaneously, I'd bet on the Avengers
As long as Star Wars has NJO Luke Skywalker they have chance. Also if they Have the Death Star Bye Bye Avengers. Im starting to think this fight is little on sided. I think The Avenger and the JLA VS Star Wars would be more even. But still its one sided. I mean Star Wars has the Death Star, Super Star Destroyers, Star Destroyers, and NJO Luke Skywalker. If any hero got hit by the death star they be erased from existence. Yes Every one Im admitting that Superman would loose. Star wars has to much technology. Now if was Jedi Vs Avengers, the Jedi would get mudered except for NJO Luke Skywalker which would take out many heros but would be eventually killed.