A lot of things been written about Gamer Gate. Some of them wrong, some of them stupid, some of them both.
A lot of the confusion (both accidental and malicious) is because Gamer Gate is three separate things clustered together under one name.
The Three Stages of Gamer Gate
Gamer Gate began in a relationship spat. Person X was dating person Y. At some point person X realized that person Y had engaged in a pattern of cheating and lying, and person X blogged about the dirt.
This relationship drama was the first stage of the GamerGate, and as a he-said-she-said tale, it's of interest only to the two people involved, and their friends.
The blog post, though, went beyond "she told me she loved me and then she showed she didn't", and alleged that the unfaithful partner had slept with powerful media figures in the small world of computer games journalism…figures who either reviewed games coded by the unfaithful partner, or managed writers who did review the games. The alleged behavior is (at best) a breach of common sense, and (at worst) a major breach of journalistic ethics.
This gamer journalism drama was the second stage of GamerGate, and as a sex-for-positive reviews scandal (unproven, in my mind), or just as a "jeez, gamer journalism is as corruptly orchestrated as mainstream media is under Ezra Klein's Journolist" scandal, it's of interest to the tens of thousands of people who read and write game review journalism… which doesn't include me.
This is where things got wacky. And by "wacky", I mean "exploded like a barbecue grill when liquid oxygen is poured on it."