and what is wrong with using an "online episode guide" for the subbing?. You are still understanding a ton more than watching it raw, now remember... I'm a big raw watcher so I still found it helpful.
If it's okay for me to step in here, I think there are two main problems:
1. Even if the guy admits he's basically guessing on a lot of parts, just having subs there adds an air of legitimacy to the project. I saw this a lot during the speedsubbing boom in anime fandom, when you had people PASSIONATELY DEFENDING translations that were widely known to be wrong. People did this either because the guesslation was the first sub they saw and they didn't want to acknowledge that their first reaction was wrong, or because the guesslation reinforced what they
wanted to believe about the show.
2. Even if you do accept that only part of what you're seeing is accurate, you still have no way of knowing what parts those are. So while you will be getting a lot of useful information, you'll also be getting a lot of information that's downright wrong, primarily in things that aren't covered in summaries, like characterization.
On that point, if he's mostly subbing characters based off of "tone of voice," his subs are probably reinforcing whatever natural biases a raw-watcher would already have. This adds a further sense of legitimacy to the subs, leading to perceptions that can be even harder to dispel, even after the show gets a real translation. (And if you find yourself doubting the annoying tendency of fandom to cling to information that's obviously wrong just because it reinforces their biases, just repeat to yourself these words: "Lost Galaxy was more popular than Gingaman in Japan.")
In short, it's pretty much the embodiment of the saying "the blind leading the blind."
Now, you can say "well, the guy admits that he's making things up, and people are stupid if they can't read the fine print," and you'd be right, in part. But stupid or not, it's still going to happen, it's still going to shape people's notions of the show, and it's still going to lead to conflict in the fandom.
So anyway, I hope you can at least understand why some people would be put out by the fact that RRR even goes there, and not want to see the practice spread or encouraged.