Rabulias
the Incomparably Shrewd and Clever
As for not wanting Luke to rescue Han, Leia, and Chewie, Yoda and Obi-Wan were completely justified, I believe, in having concerns about a powerful Force user with minimal training entering into a trap set by the Sith. I will note that they still let Luke make his choice and go. If Yoda wanted to, he could have stopped him from leaving in any number of ways.We knew that they were more long game thinkers who disapproved of Luke going to rescue his friends in the short term. We knew that Obi-Wan was willing to distort the truth and then rationalize it poorly rather than level with Luke. So, yeah, there are questions about just how upstanding they are.
I will agree that the prequel trilogy does raise some difficult questions about the Jedi Order's policies. But just within the original trilogy, Yoda and Obi-Wan give no basis to tarnish the Jedi Order. Keeping Luke's (and Leia's) parentage a secret was on the two of them, not the Jedi Order.