One challenge on the internet is that no one verifies whether the people posting broker reviews are real clients. What’s to stop some obscure broker from trying to fake a reputation by having its employees post positive reviews for itself and negative reviews against its better known competitors?
That might explain why some little known brokers seem to get great reviews online while more established brokers with clients around the world get poor reviews. Unfortunately, there are many examples of traders who were fooled by online brokers reviews as this discussion shows: I think I'm being scammed by my broker
While there is no perfect solution, a better option, as we point out in that discussion, is to focus on forex brokers that are regulated by government bodies in major financial centers around the world.