Right now...
Alfonso Cuaron. If only for Children of Men. It's just. that. good. Also made the best Harry Potter film.
Nicolas Winding Refn. Pusher, Valhalla Rising, Bronson and Drive. Nuff said.
The Coens. For me, they've never made an actual bad film. But they have made some of my favourite movies ever. Miller's Crossing, O Brother Where art Thou and of course, The Big Lewbowski.
Brad Bird. Incredibles and Mi4. 2 for 2 isn't bad... he'll be THE action movie director for years to come. Serious
Guillermo Del Toro. Pan's Labarynth is a bonafide masterpiece. The first Hellboy is great, the second not as good, but still visually awe inspiring. He's probably my favourite director when it comes to visual flair and originality.
All time...
Steven Spielberg. No explanation needed.
David Lynch. Love his surreal, nightmarish noir style. His films really get you thinking and questioning ****. Also one of the very few directors that can actually make me really unsettled. Not scare, but just, I find it hard to explain. Make feel "uneasy"?
Ridley Scott. Alien and Blade Runner are amazing, seminal sci fi films. Gladiator seems to get a lot of hate these days, for some reason. But Kingdom of Heaven (the directors cut anyway) is his best film imo, outside of the two sci fi masterpieces. I don't think there is anyone who can create world as well as Scott. The visuals, the sounds, it's like you can even smell the worlds he creates in his films.
Terry Gilliam. Bat**** insane and I love it. But there is method to his madness. IMO one of the best at doing the whole socio-political theme/commentary thing, but making it fun using bizarre humour and crazy visuals.
Francis Ford Coppola. Apocalypse Now is probably my favourite movie ever. Just his visuals have so much depth and meaning to them, more than a lot of directors manage to get with their whole film.
Martin Scorcese. It's ****ing Martin Scorcese!
Sergio Leone. THE guy for westerns, no doubt. The Dollars Trilogy is great fun, but Once Upon a Time in the West is the best western ever. Once Upon a Time in America isn't too bad either. An influence on so many directors. Speaking of which...
Quentin Tarantino. **** the haters! The guy is a genius. People say he isn't original and that he just copies. No, he is influenced, but he takes all those influences and styles and mashes them together to create his own style. It's called "Tarantino". And it's out of sheer respect and admiration that he uses the styles of guys like Leone, there is nothing malicious or "hacky" about it.
Peter Jackson. Creator of the best movie trilogy ever. He gets a free pass for life from me. King Kong was great too, if a little self indulgent and overblown.