I will say this if even the press is not interested in talking about your game, don't blame Steam for not showing your game to more people (I would imagine there is a connection somehow)
Joking aside, the issue is that there are just too many games, the gaming press mainly focus on the AAA stuff (well most of it, I have doubts they talked much about Valves no games, but even Valve didn't talk a lot about them). You do after all have dedicated sites to Nintendo and PlayStation and stuff like that. You only have maybe less than 10 really big and well known game publications. I would imagine that they don't have a lot of staff to keep up with all of these game releases.
Now talking about reviews, I have no idea how reviews are made but I would imagine that most of the press don't play these games until the very end since they have limited time to work on the reviews.
One issue that some may have with reviews is that they are inconsistent (maybe having a lot of games releases has to do with this), since you may have reviewer A review War the game, and reviewer B review Farm Farm. But then you decide to have reviewer B review War The Game The Sequel, since reviewer A is far to busy reviewing Alice's Amazing Adventure by Soytendo (everyone's favorite Korean developer and yes it's an MMO).
So you have to many games, not enough reviewers and in the end you end up with games that don't get noticed.
Based off of what some of you have said I'm going to assume that Jason has only just heard about the Disco game rather recently (did other people at Kotaku know about the game/mention it at least?) Despite people already knowing about the game. Hell the Travis Strikes Back game had a t-shirt in the game for the Disco game, so even Nintendo specialty sites have mentioned the Disco game.
I would imagine that clicks also play a role and if you can't make articles that get readers than you will be let go, and from the looks of this letting people go is what a lot of news places are doing now.
I think I mentioned this before already but from what I have seen in the past when Luna Nights came out and had sold over 100k copies on Steam, Gemastu was one of the few sites that reported that, other sites didn't even seem to write a review for the game despite it having overwhelming positive reviews and being well liked in general.
I think there were more gaming sites in Japan that were covering the west than western sites.
I'd imagine being an indie dev is both very easy and very hard. It's easy because now a days anyone can be an indie dev but it's hard because you may not be able to make a living off of it.
Also we may eventually get to the point where some of these sites are just shut down because of loss of interest from readers.