We all know the final fate of Anakin Skywalker. The whole focus of Revenge of the Sith was the opportunity to see the whole journey of the Chosen One and view his deeds in the Original Trilogy in a new light.
But it's not only Anakin who is cast in a new light.
Obi-Wan and Yoda come in for some close scrutiny as well, in view of the years between Sith and Hope.
If you think about it, when Luke arrives on Dagobah in Empire, and Yoda plays the fool, there is no doubt about the fact that he will be trained (much like when you realise that all the Stormtroopers on the Death Star were aiming to miss, so the tracking device could lead the Imperials to Yavin 4). Yoda plays this up to the max, to make Luke want it so much more. He knows that Luke, like his father, will want it more if he's told he can't have it. The same, to a degree, could be said of the actions and words of Ben.
But if you think about it, the last Jedi that either Ben or Yoda trained was...Anakin. After a 20 year gap they have the chance to rectify what they believe was their own errors. And the next one was Luke.
Everything that Ben and Yoda say to Luke in regards to the Force is largely 20 year old knowledge. The difference being that Yoda has studied with Qui-Gon, who has become one with the Force and has a different perspective, one that he has imparted to Yoda and Ben.
(Of course, George didn't know this when he wrote Empire back in 1978, 15+ years before he even created Qui-Gon)
So, from a logical point of view, forgetting about real-world facts of when things were written (and bearing in mind Lucas had time to run all these thoughts through the wringer so he could link everything together) we can look at Ben and Yoda in a different way as well.
While we always believed Ben to be deeply knowledgable and wise, he is clutching in the dark in much the same way as Yoda. In fact, to bring Luke with him to Alderaan he employs some questionable tactics - you could say that he allowed Beru and Owen to die, knowing it would be the push to get Luke to leave Tatooine - would the younger Kenobi have done that? When Luke leaves Dagobah to save Han and Leia, Yoda bemoans Luke's actions - "Told you I did, reckless is he." And he was right, Luke was, just like Ben and Anakin before him.
Neither Ben or Yoda knew the way Luke would truly react, and there is the twist.

There was every chance that things could have gone desparately wrong on Bespin, and Luke could have accepted Anakins offer to join him. What then for the Jedi cause? Luke, as a darksider, would have led Vader to Dagobah to kill Yoda, and the Jedi would have truly been extinguished.
Ben and Yoda were flying on a wing and a prayer in regards to training Luke, with nothing like the careful preparation that Palpatine employed to bring back the Sith.
Now how do you view Ben and Yoda?