He has some takes and interpretations that I don’t think are backed up well. For example, he has his diagrams showing the state of the balance of the Force at different points in the saga, and he portrays the pre-TPM era as unbalanced because of Palpatine’s scheming and various other negative forces. Yet he claims that the post-RotJ is a time of balance, despite the fact that it has pretty much all the same problems as the TPM era (including a living Sith lord).
The point is, while he’s a good source for quotes from the man himself, his interpretations are still fallible.