I've browsed it before a few times...
Some of their reviews are fair, balanced and respectful, going into detail about what goes wrong in the story and offering input as to what could be done to improve it. This being a decent example.
Others are biased and immature, such as a rant against the entire genre of the story, or complaining that it even has a story. This one is a huge offender.
Granted, I've never read Edge, and only part of Earthsong(The latter being fairly decent IMO), but there's really a HUGE, OBVIOUS gap in quality between the reviews themselves.
Frankly, I think a general webcomic wiki, preferably with multiple reviewers would be more in order.