I always thought so. I never got this impression of Stewart being as some described him as the "best actor on television" at times during ST:TNG.
He could be great in episodes written specifically for him such as "The Inner Light" but I thought he never really commanded attention when he wasn't the focus of the show.
He could be great in episodes written specifically for him such as "The Inner Light" but I thought he never really commanded attention when he wasn't the focus of the show.