You others may know better, but does Robert really say all that much different from the other "bashing" sites? Is it what he says that is different, or how he says it?
One thing could be the sheer magnitude of how much he says, but in that respect, the problem with the "bashing" sites is that they don't have enough dirt.
It's both.
I think the sheer magnitude of evidence is a big part of it. Robert's site bombards people with the facts, one straightforward article after another.
Bashing is probably fine if your audience is intended to be other skeptics, but it doesn't really work well for believers.
Because of the nature of a web site like this, the danger is that you might actually alienate the followers to such a degree that they begin to sympathize with Browne. It seems like a fine line between presenting evidence with sincerity that draws the followers in, and crossing the line into the type of commentary that might actually push them closer to Browne by making them feel sorry for her, that kind of thing, which is a reason why "bashing" can have the opposite effect from what's intended.
He mostly allows the evidence to speak for itself. That's a big part of it.
But here's what I think is really key. If you notice, because he doesn't stoop to Browne's (or some of her followers) level of threats and insults, he appears the better person.
When Browne or anyone else tosses something at him that seems immature and petty, Robert responds with calm and maturity. When Browne is nasty, Robert is dignified and reasonable. When Browne seems illogical, he responds with logic. Where Browne seems cold and indifferent, even cruel, Robert is sympathetic and outraged. In his articles his sincerity is difficult to miss. People see all of that, and to a believer, Robert actually comes out looking like the better, more trustworthy person (which he is!).
Anyway, just the 2 cents of a former "woo," for what it's worth