Well, if Anakin's midichlorian count was higher than Yoda's, it may suggest that by the time the OT took place, he was actually more powerful than Yoda (maybe). As for Obi Wan, well, we saw what happened to him when he fought him. Plus, by this time, the Emperor would have had gazillions of stormtroopers surrounding him, preventing even the most powerful Jedi from reaching him. They may have realised that by backing off for the time being, and concentrating their efforts on training Luke, they would have a better chance of vanquishing the Sith.
That's similar to what I was thinking. It also explains how the Jedi get wiped out. A Jedi can't block 1,000 laser shots at once. If they go up against enough clone troopers at once, they will die pretty quickly.
I say that Yoda and OB1 knew that they couldn't get close enough to the Emperor to fight. They would have to kill a billion stormtroopers. Only a child of Vader would be able to come before the Emperor.
New Question: I hate midichorians, so I'll ask it in a different way: Does Luke have more "potential" than Darth Vader? or does Vader's mechanical body slow him down?
Vader's body is no barrier to his force power, though he is a cripple physically.
However, the question about whether Luke has a higher count is unknown... and COULD be answered...
And the MCs REALLY aren't that bad...
Jedi seem to be able to surive agauinst armies, just not defeat them. Whether it will be billions of clones that take them out is unknown- but I reckon NOT. Especially as, from the best info we have, the Jedi WON the Clone Wars.
You have to remember that we've only really seen two Jedi, who are actually very very good. It's easy to forget that Obi Wan and Qui Gon aren't just two normal Jedi, Obi Wan becomes one of the greatest Jedi in history and Qui Gon was a council worthy Jedi. I think we'll see some relatively untalented Jedi in Episode 2, and they're probably the ones who only survive a couple of seconds against a droideka.