Force powers need concentration, and do you think a Jedi can concentrate on using the Force while getting shot at? 
Were they really getting shot at? I mean really, where were the fighters? There's like 20 Venators or Acclimators and an equal number of seperatist ships and the only fighters we see are some off the command ship and some random group of attempted x-wing predecessors who's only apparent use is to draw off the droids and die like pigs.
Kenobi had time to look all around his fighter instead of where he was going. And really how much time does it need? In combat they used the force as quickly and effectively as throwing a normal punch. Darth Maul, slash slash slash, throw a punch push Kenobi off the catwalk. Kenobi and Qui Gonn, slash slash slash, throw some droids into other droids. If not Kenobi, what about Anakin? They were both focused enough to hold still, while the other one fired blasters to pick off droids . . and later to hold still while the other scrapped his wing on the other fighter. This doesnt require concentration?
Other guy said:If you can land a sophisticated droid on a starfighter's surface, why not just land a bomb on the fighter instead and blow the canopy off?
Er, why land anything? Why not just use a normal warhead and blow up the fighter?
Someone on another forum thought it was so the buzz droids could capture the Jedi or something. Why ever they'd want to capture rather than kill is beyond me.
Other guy #2 said:Well, the start was good, with the camera soaring above the relatively peaceful-looking Venator only to drop into a huge mess of a spacebattle taking place below it. Too bad the awesomeness ended the moment it zoomed in on the jedi starfighters, because that battle really had potential.
Hmmn, the camera followed the fighters from the very start. If the fighters just as you said, lead the camera to the battle then it would be cool. But no, the fighters just fly around through the battle . . la la la . . oh here comes some droid fighters, oh no! Wait, some clone buddies will come to draw them off and die. Oh wait, missiles incoming, let's fly around some more this time with missiles on our tail. Then let's spend 5 minutes solving the problem that the improbably missile left with its impact. Oh now we can lend .. . . and get on with the movie. Later we'll land a half a ship on a very convenient runway.
Or I mean, the camera can still follow the fighters and show an exciting battle. Hasn't anyone seen Serenity? That's a good example of an exciting space battle while following one ship. Star Wars, not so much. Lucas could learn a thing or two from Joss Whedon.