As far as my job's concerned, actors are just meat. My work's pretty much the same no matter who's in front of the camera, hence my very rarely mentioning them on the blog, but I've been asked the 'which actors are cool' question more than almost any other. So, here you go:
Most of them fall into the 'meh' category. They don't really have much to say to the crew beyond bland pleasantries between takes, and there's nothing wrong with that.
The only thing I really ask of actors is that they show up on time, know their lines and get the hell out of my way when I'm trying to work. In return, I stay the hell out of their way when they're trying to work and do my best to minimize on-set hazards (heavy items falling out of the rigging, tripping on cable, salami farts).
There are, however, some actors who are super nice and/or more fun than a barrel of monkeys, and I'm always glad to see their names on the cast list.
Some big love (in no particular order) to:
Sarah Polley and Stephen Rea (the only two actors I've ever worked with who have refused to cross an IATSE picket line, and I love them both for it)
George Clooney (even more fun than a barrel of drunk monkeys wearing clown suits)
Billy Bob Thornton
Keanu Reeves (who has always been very gracious about my inability to completely hide the schoolgirlish crush I develop whenever I work with him)
Keep in mind that this is just my list, and I'm sure I've forgotten someone. Every crew person's list is different, as it's possible for an actor to be a dream on one show and a complete pill on the next.
Couch of the day: