I'm not a fan of Palpatine being able to cloud all of the Jedi's vision completely like he does. I'm ok with him masterminding the War to get him more power. That's fine. Even better if the Jedi sense it, and suspect the Chancellor. Otherwise, what about Yoda telling Luke that the Dark side isn't stronger? AND being emphatic about it? If the Emperor is powerful enough to cloud all of the Jedi Council's vision... maybe the Dark side IS stronger... Maybe Yoda was so emphatic because he's embarrassed that the Dark side is stronger and doesn't want to admit it...

Along that point, IF Yoda and Palpatine go head to head in a duel (which I'm honestly ok with), I don't think they should be even close to evenly matched. I want Yoda to thrash the Emperor, but quit the fight because innocent lives are in danger or something like that. Make it so that Yoda "fails" because he is protecting lives, not because he's weaker.