When i started posting reviews i was, how you put it a little green behind the ears i had a few reviews dissapear so i agree admin does rummage through reviews throwing away ones he doesn't think are "genuine"
But i also agree with what delboy has said, it is off putting for newbies when they see established nembers being challenged over a review. Some newbies have even said why bother doing a review. There will always be tell tale signs of dodgy reviews and those will get picked up straight away, you'll always get fluffy reviews or those that have lack of info. But what will always be the case is "ymmv" no two pints are the same imho 
Some people her are still bitter about golfnut, jawbreak and dodo, hence don't like established members being challenged even if they are dodgy. Fact is it will continue, more reviews are happening as statistics prove. there is no statistics that this forums robust atmosphere stifles reviews because it doesn't happen.
there will be false starts like the bearcat69 accusation to excalibur, but I can see what caught his attention and followed forum protocol of challenging. what i notice is many challenge nothing and some more than others up to them of course either way how much they put in or take out.