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Mace Windu decides, after getting information from Anakin, that he is going to confront and arrest Chancellor Palpatine. He picks as his helpers what would appear to be three of the shabbiest Jedi he could find.
Saesee dies immediately. He is technically ranked as a 'Master,' though you wouldn't know it the way he holds his lightsaber in the manner most would hold a vacuum cleaner, yet uses it to even less of a defensive advantage. The novelization goes into great albeit unnecessary detail about how he had two horns but one got cut off in combat but had grown back perfectly so that one could not even tell. This makes one wonder why the horn being cut off was even brought up in the first place.
Kolar lasts a second longer than Tiin, but wields his lightsaber even less expertly. By this point, the viewer is wondering if Mace even bothered to find Jedi to accompany him to Palpatine's office, or if he just rounded up some panhandlers along the way and handed out lightsabers.
Kit Fisto is everyone's favorite Jedi whose name sounds like a bizarre sexual fetish. We know Kit Fisto is going to put up some fight based on his major role in the Clone Wars cartoon series. However, while Fisto does great things in the cartoon fighting alongside the Mon Calamari and using his lightsaber underwater his technique in the movie seems to more closely resemble that of a frightened, blind gimp than a Jedi Master. Fisto just holds out his lightsaber with a look of total panic on his face. His notoriety from the Clone Wars series appears to only buy him a few extra seconds of screen time before finally being struck down.
It's apparent that the intent of this scene was to show how powerful Sidious is. Unfortunately, it fails for two reasons. 1.) We haven't really seen these Jedi do anything worthy of note. Aside from Kit Fisto deflecting blaster fire from battle droids in the previous movie (which, if these movies are any indicator, it seems anyone holding a lightsaber is able to do), we haven't seen him do anything outside of the cartoon series to show that he is even a subpar Jedi. Given our lack of knowledge about the inept Jedi "Masters" that Palpatine faces, he might as well be striking down his cleaning lady. 2.) The Jedi die so quickly, by such weak attacks, that they just look like a collection of fools.
If they'd already been shown as skilled swordsmen, then it would be quite shocking that Palpatine dispatched them so easily. Unfortunately, we don't know them from a hole in the wall, so Palpatine's seemingly harmless attacks make them look like unskilled circus performers.
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I think this says it all...