As a fan of the series, I think the costume is... interesting. I don't think it deviates from the original enough to justify calling it different. Batman, Joker, Two-Face, Scarecrow, and Ra's al-Ghul had significantly different looks to them. Batman had all black with his costume resembling armor more than black and grey/blue and grey cloth/spandex like in the comics. Joker had a much bigger coat and his costume was less brightly colored than in the comics., with no oranges, yellows, or blues that occasionally appear on his shirt, and of course his make-up and hair were just grease paint and greasy hair rather than actual skin and a slicked back green do. Scarecrow and Two-Face only had their faces to identify them, and Ra's was pretty unremarkable. And of course there's the X-men with their stupid leather jumpsuits, and Catwoman's skimpy leather clothing. Whatever.
GL's only real difference in costume is the veins of light that run down his chest, and quite honestly, I don't think it's that bad of an idea. The whole "light in darkness" thing is obviously one of the major themes of the series and this reflects that. On a less pretentious level, it does look cool to have something that illuminates Jordan's cheesy rubber bodysuit. But again, I don't think this is a significant enough change to justify thinking too much about.