Star Wars suffers from a few continuity issues where Jedi ability is concerned. Before this is pointed out, it must be remembered that this occurs in situations where the Jedi would be pressed to use his or her ability (IOW, they are not holding back for any reason, etc.).
In Revenge of the Sith
, Obi-Wan and Yoda cut down a large company of clones like a hot knife through butter with no difficulties. Even the ultimately ill-fated padawan who attacked the clones fared better than Jedi with decades of training / experience.
Similarly, Luke destroyed Jabba's army of henchmen with little help in Return of the Jedi
However, when Anakin and the clones show up at the temple, the Jedi are overwhelmed like children. I'm not buying any "but Kenobi, Yoda and Luke are among the most powerful Jedi" stuff, as we already have the example of the padawan Bail observed holding his own better than the more experienced Jedi.
It appears Jedi are big time ass-kickers when necessary, otherwise, they roll over and die with the ease of the old, green plastic soldier toys.