Frankly, I don't even consider typing out "Fix your grammar and bother taking the time to think about what you're writing." to be criticism or proofreading. Common sense says that if you want people to read something you write, especially something that is explicitly supposed to be informational, you need to make it at the very least bland, preferably enjoyable. To be honest, though, this looks like what it apparently is: a couple of guys who saw some of the more successful review sites on the internet, (likely along with a certain list-based comedy site) and decided "Oh, cool, we can do something like that!". The thing is, even reviews of 'vidja games' on a smalltime website need to be at least somewhat professional to attract readers, going beyond simple grammar and organization to include some touch that makes their reviews different, that gives them something to distinguish themselves from the thousands of other reviewers who are already established names with followings.
Of course, if they were really going at this seriously, all of this should already have come up in a discussion of their mission plan for the site. As some other people have pointed out, having a not-for-profit review site doesn't mean they're a company. Although there was one post mentioning that they're hoping for some sort of nebulous profit to come their way somehow, and that anything left over after paying for keeping the site up would go to any potential authors they bring onto the staff. Suggestion: Banner ads.
That said, if your friends went at this idea properly, setting up a way to pay for the site, and ensuring a decent standard of quality on the writing, they could probably be moderately successful, as the idea of throwing up short expos on a wide range of media and genres probably has enough room for them to dig out a little niche if they apply themselves to it. In all seriousness, though: proofreadingrandom comic sans horror may be painful and evil if they aren't used to keeping quality up in their writing, but they won't get anywhere with work filled with grammatical and spelling errors. Except possibly fanfiction.net.