I don't have much to say about this one, because it gets everything right, really. The story is based on true events but is so interesting that you wouldn't think it, the performances are great thanks to the film's cast being so superbly well-matched to their characters, the film is slick, stylish, and on point, and it's just the right length for what it offers.
A job very well done. I will say that it did lack the 'wow' factor a little for me (I accept that this is a pointlessly-vague criticism though) as, whilst it was a great watch, I'm reluctant to add it to the list of my favourite films anytime soon. I don't think that's what 'Argo' is really going for anyway though- it simply wants to tell a story, a story that actually happened. In that sense, it is a perfect film.