Bingowings said:

When I see the OT Yoda I see Yoda (with wonky eyes in ROTJ but still Yoda).

When I see the TPM puppet I see a puppet, when I see the PT CGI Yoda leaping around with a deadly weapon I see an inexcusable farce with all the irony of Buffy Summers' impersonation of Gandhi only unintentional.

TPM Yoda aside (which in my opinion is only believable on TPM Visual Dictionary), both Yoda's have their limitations.

OT Yoda, with his mouth and general movement, and PT Yoda, with the lightining and texture.