very good at what he does, each character he plays looks real. seems to like playing complex characters or hard to catch at first glance and is very convincing doing it :)
the accent makes it harder to get sometime for foreigners like me, but when you hear him talk you recognize him out of any other actor at once and that is good, very few actors have this particularity !
he was the only reason that kept me watching ST-Universe, althought all the flaws that show had (filming mostly and a few not that good actors/actress...) and it's the same reason why i watch once upon a time
he seems to be stealing the show to other characters that should be central but well.. that's life ! others will have to up their games ;)