This is the first I've heard of reviews being rejected as "too harsh" - and very disappointing.
I too ignore reviewers with only a few posts ... and find that reviews starting "i wasn't sure what to expect ..." are often clearly bogus!
I've complained in the past that reviews of new locations were being rejected because the Tripadvisor staff couldn't/wouldn't authenticate the location - without giving me (a level 5 reviewer) a second chance to validate the new place.
So what can we use instead of Tripadvisor ??