LOL I'm sorry but Siddig is JUST awful.
Its always very obvious that its him playing another person, you never really feel he's the character. Its as if you can see the cogs working behind his eyes.
His performance in Doomsday was dreadful.
Oh and he's just completely incapable of expressing anger without sounding fake and stupid. Him and Garret Wang are in the same boat there.
Oh and I love pretty much every Ferengi episode.