If I understand correctly, the frustration that many people feel towards Rathbun is because he hasn't accepted responsibility for all the attacks he orchestrated against Scientology critics and escapees, before he left.
That he is now the target of OSA attacks (actually a very watered-down, ineffectual shadow of what OSA used to manage) does not win him any sympathy, merely a smirk at the thought that the boot is on the other foot now. Further claims the he has the power/information to bring down the Scientology pseudoreligion invite no sympathy at all, merely a frustration along the lines of "Well go on then... do it."
The idea that Miscavige is the only thing wrong with Scientology today is a misunderstanding that disregards historical fact: the RPF, the disastrous Operation Snow White, Fair Game, R2-45, Space Opera... an amazing amount of that which is stupid and evil in Scientology came straight from the pen of the Fat Man Hisself. Being still a victim of Scientology, Rathbun is unwilling to admit this. Any anger towards him is simply an expression of distaste for his goal: a world in which the madness of Hubbardism triumphs, having used the simpleton Miscavige as a scapegoat and set himself up as the replacement. (It's true that Miscavige is a drunk and he attacks people... but Hubbard himself was the original source of the malignancy at the heart of Scientology.)
Being the creature that he is, Rathbun believes that the end (ie him in control) justifies any means. I'm not angry towards him, personally... but I wouldn't trust him an inch.
I check for new material/read the Rathbun blog daily. I am definitely OUT, no longer a Scilon, but I am still a bit sympathetic towards Rathbun and Rinder. They both pretty much spent their entire adult working lives in the cult. There is the issue of weather or not Marty groveled sufficiently upon leaving, same with Mike, to atone for the things they did while in the cult. I personally don't concern myself with that. As best I can tell, Rathbun is not even agressively marketing anything. All he is doing is allowing DM to drive people his way. He has a boutique, niche market clientelle of ex Cof$ clams that arrive looking for high end, connoseur quality clamtech without all of the high pressure redging/invals/evals/shit-4-service/shit-4-auditing that is now what is happening at Flag. I'm sure there are other similar groups out there doing the same, left over from the mass exodus of the early 1980's when DM worked with the HubTurd to squeeze the mission network for cash and take them over. But they are few and far between. If Cof$ is put out of business, these groups will have to do their own recruiting. This will be difficult at best.