Why do they need to continually have a Sith rise up to control the galaxy every 50-100 years? According to the PT, no Sith had been in power "for a millenia", so why the hell does it need to happen so often now? Are the Jedi even dumber than they were before to continually let these Knights cross to the Dark Side and then take over the galaxy?

Why not try something new? Instead of "the Sith of the week" or "the super weapon of the week", they could just present a conflict on a planet that someone needs to resolve. Or they could write a book about one character, maybe something like I, Jedi. Why continually rehash the same thing, over and over and over again. It gets tiresome. "Oh look, it's been 100 years since a Sith was in power and now there's one there again. How did that happen? Oh yeah, he got a bunch of bad guys together and slaughtered all the stupid Jedi who were to damn blind to see the shit happening...AGAIN!"

The Star Wars galaxy has been in a state of perpetual conflict since the PT. You would think a group of people charged with "keeping the peace" would have learned something about seeing it coming by now.