But it IS bad. I atribute it to them both acting less and less and the fact that for Takei it was a really big deal. I think he was trying too hard and not being natural.
Thinking--"I'll show them I can carry a show!"
Agreed, but I find myself wondering if there was an aspect of sibling rivalry involved. The VOYAGER writers, producers, director, etc., might have subconsciously wanted the prior "generation" guest stars to come off badly so that VOYAGER itself would look better by comparison. And if they want you to look bad, you are going to.
I'm sure this suspicion is mostly or entirely wrong, and the guest stars really were just wooden that day. Stiff acting was a staple ingredient of the Classic Cast films.