Sam, I think this is the type of question where it would have been more appropriate to PM either Luke or msyelf.
You are seeking an absolute response to a question where we can't give an absolute answer. What I will say is that if you post a review along the lines of (for example), "LPB is #$%^, we caught no fish and the guide was useless and is an imbecile", I would remove it. Why? because that isn't a trip report, it is a rant and it personally derogatory.
We have no background to why, what the conditions were like, whether you know how to fish at all etc. On the other hand, if you post that we didn't catch any fish, conditions were awful, guides appeared to be inexperienced and you provided the background, I would have no problem with it. Of course, following on from my previous example, I would debate the point as to whether the guide was inexperienced because I think the two brothers from LPB are among the best GT guides you will find anywhere.
Provided a post is reasonable, I think we would let it stand. If it got personal, derogatory or was simply unreasonable, it would be at risk of removal.