Let's get this straight, I don't think GL is bad nor is he bottom 5. However, his issues still stand because he hasn't really gotten any fixes or changes.
His health is the same as Superman, Wonderman and other chars at 1050. Everyone gets much more damage for 1 bar than we do, but we always need 1 bar to do damage. We're so meter dependent, even using meter for rolling or pushblocking could hurt us.
His zoning is atrocius. You dont have to take any of it and if you do, it's just a gimmick. His battery blast is - on hit, the startup of his overcharged lantern is 32f, his bowled over is - on hit and horrible on block.
From what I've heard, GL is supposed to be a zoner/space control character, but everyone else can do it better than us which is why most of the guys have switched over or have secondaries they mess around with more.
GL is not bad at all, but he is not as fair as some people make him out to be and it takes a lot more than just b1 and lantern's might to win games.