Concering Teh Ubar-Jedi...
Ignoring the other apocrypha for a memonet, go watch the movies again... Carefully.
The only Jedi you'll see performing extraordinary tricks with the Force are those small handful who are (A) primary characters to the story and (B) are generally regarded by the other characters in the movies to be the very most powerful Jedi (or Sith).
Lets look at that list, in no particular order...
Qui-Gon, Obi-Wan, Darth Maul, Anakin (Darth Vader), Count Dooku, Mace Windu, Yoda, Darth Sideous (Palpatine) and Luke.
Aside from that, there are only a few scenes where we see other Jedi in action...
The Battle of Geonosis. In the background, we see dozens of Jedi fighting the droids and Geonosians. For the most part, none of them are flipping or twirling or anything... They are barely holding their ground, and by the time the survivors are rounded up, more of them have died than not.
Palpatine's Arrest. Within a handful seconds, Palpatine kills three fully fledged Jedi Masters who are ready for trouble and are not Mace Windu, Yoda or Luke.
Order 66. In the field, several Jedi Knights and Jedi Masters (except Obi-Wan and Yoda) are shown getting surprised and cut down by small numbers of Clone Troopers. Back at the Jedi Temple, the Jedi (including several Master and Knight instructors) were slaughtered by Anakin and his Clone Troopers... One young Jedi was shown killing a few Clone Troopers in an attept to escape, before getting killed, but he did nothing especially fancy except for hitting them with a glow stick.
The long and short of it is that the only "uber-Jedi" (in the movies, at least) are the plot-important characters. We simply can't judge the rest of the Jedi based on such a small sampling, especially considering what we've seen of them rest of them. It'd be like painting all Star Wars smugglers or bounty hunters with the same brush used for Han, Chewie and Lando, or the Fetts.
Of course... The novelists and cartoon pastichers seem to have run on that assumption, so who am I to complain?
