As you can see, fan reaction is against it... but there's actually nothing wrong with this idea, other than the fact that Guy is not their favorite Lantern...
I personally think the idea of an superhero who is an a-class jerk is kinda cool... honestly, most people in real life are jerks ESPECIALLY when they get power... I think Guy would bring that to front and make the whole experience less surreal and more... credible... you KNOW this guy, he's not perfect, he's not successful he's not a cliche everyman... he's a guy you know and he gets all this power... and madness ensues... in the course of things he learns to take some responsibility and, even though he doesn't learn to be a team player, he does learn to step up to the plate and give all he's got for someone other than himself... I think it'd be great...