To OP: I just love people re-posting the thoughts of some other guys, without any thoughts themselves....
Fictionvision: Unfortunately it's being curated by the kind of people who voted for The War Z. My understanding is the game got a free pass around Greenlight due to the company having another game on Steam already.
Doesn't matter. You cast your vote on what you see / is presented. That doesn't automagically remove all games that are:
a) unoriginal
b) great to play but simply rip-offs
c) looking great on presentation but coming with horrible controls / bugs / whatever
For example: was Minecraft just the inspiration for Terraria, or is Terraria a pure 2D rip-off that shouldn't have been made in the first place? Each can answer that themselves.
In the end Greenlight isn't as great as it could and should have been. But having a choice versus Valve deciding alone, isn't even a contest - besides the fact that even if a turd made it through, I'd still don't have to buy it.