Beltran was wooden even when he
did have something to do.
Equinox part 2 comes to mind, I remember thinking that he looked indifferent and bored during the scene of confrontation between him and Janeway.
The Equinox crew were being punished and are all accessories to mass murder. I'd lock them away the darkest, deepest depths of Voyager, never to be seen again too for what they did.
Sorry, but that's not what happened, and they were not being punished. There's absolutely no reason why we wouldn't see them again.
And if they had been punished, which they hadn't, then the lack of follow-up would have been unexcusable, rather than just lame. In that case, we definitely should have at the very least heard about where they were and what had happened to them, if not seen the ongoing story of their fate on the Voyager. Voyager didn't normally have prisoners, Suder is the last/only I can think of (not counting people being in the brig for a limited amount of time, like Tom in Thirty Days). So, you've just provided another example of VOY's failings.