I actually like The Light.. but it very much seems like a pre-release song.
But unfortunately, if they debuted with something more of the style they seem to have they'd flop. The Light seems like a song the Korean public will like, and will possibly give them a good footing for their next single which I'm sure will be some hip-hop stomper.
But I think it's a big shame they didn't also have a version of the music video with the actual members.