Yoda should of been in the PT, but he shouldn't of had the kind of screen time he had. Yoda was the head of the Jedi Council, thats pretty important.
I see no reason why we need a digital Yoda in the OT. If you think about it, why did Yoda need to be CG in the PT? Cause of pointless duels. He should of been the same freakin puppet from the OT when he was in the Temple.
The idea of a CG Yoda was a good one, but CG isn't good enough yet.
It is weird that we go from CG to puppet. Mabey someday, CG will take a huge leap and GL will put a consistent, real looking CG Yoda in all 5 movies.