It seems no one came here to kill you.
I think sometimes Steven Blum's acting turns a bit cliché. But then he has some awesome moments.
For me the best was the creator. I think that was James Garrett. Besides his voice being proceced I think he did a great job.
I would say that the overall quality of voice acting is pretty good, not memorable, but quite good for being a game.
By 1995 game "talkies" were just beggining to exist, therefore any actor had no experience in that field, which is quite different from any other way of working.