Hawkman was a pretty cool character Pre-52 after Johns brought him back in his JSA run, he had kind of a Conan vibe going on. He was a pretty anachronistic character, what with his usage of weapons like maces, lances or crossbows, and his methods were often blunt and brutal but he wasn't an idiot by any means, like I said, just like Conan. This worked pretty well on the context of his backstory of an Egyptian prince that keeps resurrecting time and time again. Some may argue that Wonder Woman is kind of like this nowadays, but she's supposed to have a bit more class and decorum since she is after all an embassador of peace. Hawkman is not an embassador of anything, which gives him free reign to be as violent as he wants to.
This doesn't really work in The New 52 though since he's an alien now, which makes him look more like a violent asshole than a man out of his time.
@captainmarvel4ever: I haven't read the full script yet but so far it reads like a load of nonsense. It starts out with a sequence that clearly has nothing to do with the rest of the movie just for an overglorified cameo and it even repeats an scene from the previous movie (when Clark cauterizes Lois' wound).
Until you have real, solid proof that this is in any way legit I'm not buying it.