jamyskis: I hardly think this applies here. Certainly there are games out there that cater to a quite niche audience, and for those you can use the above saying, but in the game of Steam Greenlight, many of the games are simply objectively bad.
To be very honest i don't see THAT many bad games when browsing through greenlight. Of course there are a few bad games asking for votes on Greenlight. But what else could you expect? Anyone can put a game on Greenlight (expect for porn games, since Valve doesn't like those). Just pay the U$100 fee and you're set (i don't know how much it costs now, but it used to be U$100). Getting past Greenlight, however, requires more than that.
"Objectively bad"? That's arguable. Quality in games is mostly subjective.
jamyskis: Steam has essentially become the new Wii - a pit of useless shovelware that noone wants to play on an otherwise perfectly capable system.
I disagree. Maybe i live in a parallel universe or something, but i can't see that many bad games on Steam coming from Greenlight. In my experience i feel it's exactly the opposite most of the time. Most of the Greenlit games i see are either pretty good or cater to a specific niche that i'm not a part of. But there are many games that didn't go through Greenlight that make me wonder how they got on Steam in the first place (like Revelations 2012, Garry's Incident, War Z).
I think Greenlight is a pretty good model, actually. At least it makes the proccess more transparent. How many times have we seen good games getting rejected on Steam and GOG (Mutant Mudds and Unepic come to mind)? For developers, Greenlight is extremely important, as we all know. For these guys, getting on Steam sets the difference between a failure and a success. And it lets me vote vor the games i want to see on Steam.