I used to be a fraud analyst at TA. You guys are wrong- while some bad reviews do get through the filters, TripAdvisor does not protect certain listings from bad reviews. Believe me, I have no love for this company after the class A ***** that took over my department got me fired for calling her out on questionable management practices, but the company (which is no longer related to Expedia by the way) does their best to maintain the integrity of their content.
Property owners can pay a fee for a higher level of service with TA which gets them a heightened level of response from the moderators when they want a review removed from their listing, which might be the reason some of your reviews get gummed up in the works, but if the disputed review meets the community guidelines, the review will be posted. Period.
And believe me, the behavior of the owners who make these disputes is tracked for abuse/fraud just as closely as as the members who submit reviews.
Yes, there are organizations out there trying to game the system and sometimes bad reviews get on the site but the next time you see a 'computer generated' review, instead of complaining about it on here, simply use the reporting tool on TripAdvisor (located right in the review itself) and if it's truly a fake review I guarantee you it will be dealt with.