Some counter-apologetics:
SNARE&RACKET already kind of covered this, but I'll give it a shot, too. The "Nissan" argument is really just a straw man. First, it assumes there is some sort of "profit motive" (and we'll come back to that idea shortly). A better correlate would be someone looking for a new car and perhaps Googling "Nissan". Where would they find the most unbiased information on Nissan products? The Nissan website? I know when I'm shopping for anything I like to read customer reviews, whether good or bad. I usually throw out the lowest rated reviews (folks who are just sour grapes over some minor issues) and the highest rated reviews (people who are gaga over any given product). The "truth" of the matter is usually somewhere in the middle. And imagine telling your Nissan dealer that you would like to go home and google Nissan and him saying, "No! No! You must only get information from nissan.com!" That would certainly raise some red flags.
Something else that raised a "red flag" in this blog was the quote from Lonnie D. Kliever. According to Wikipedia, Kliever seems pretty legit: considered an expert on cults and "new religious movements", he was highly critical of the government's assault on the Branch Davidians in Waco, Texas.
Then I found a copy of the paper he wrote and that was quoted in the blog, Apostates and New Religious Movements. What he writes on page 2 of the paper is quite quite revealing, and pretty much sets the tone of the paper as one biased towards new religious movements:
"I have been asked by the Church of Scientology to give my expert opinion on two broad issues: (1) The incidence of apostasy in new religious movements and (2) The reliability of apostate accounts of their former religious beliefs and practices."
Hmmmmmm. . . So who has the "profit motive" in this scenario?
Overall, I found the piece to be largely pro-cult, live-and-let-live, it's-the-victim's-fault-for-believing-this-bullshit-in-the-first-place propaganda. There are some fairly well articulated passages, though:
"The apostate should not be accepted uncritically [italics his] by the mass media, the scholarly community, the legal system, or governmental agencies as a reliable source of information about new religious movements."
I think he's right here. I felt the same way when I started my search for TTATT. There were some apostate sources I steered clear from (I won't name names but I think you know the types) and there were others who were credible (or pretty much had all of REALITY on their side, e.g. JWFACTS).
What comes out in the piece is that yes, the media likes a good story, and certain apostates will "embellish" their experience in whatever church for the shock value. But I would argue (and he admits to some extent) that a vast majority of apostates are not in it to shock, but to inform. Also, the article is (as the name suggests) targeting the idea of apostates being used in the media and in courts, not merely for the anecdotal insight they might give the average person on the inner workings of an NRM.
Unfortunately, though, he ends the piece with the bit quoted in the blog, and it's pretty clear there's a bias for NRM's at the very least in a let's-not-judge sort of way.
Want to read it yourself? Just google "The Reliability of Apostate Testimony About New Religious Movements"