Even if writing reviews is abusable at the moment, members HAVE to type something in order for it to count as a review (and moderators/other members can report it if the review is inappropriate in terms of the guidelines). As for the reputation system, nobody has to write anything, and it becomes way too difficult to monitor votes (and also if the voting was whole heartedly done or not).
In addition, members can just continue to vote for all the good or bad reviews (depending if they are for or against the server), so all the reviews would be repped like that without moderation. Furthermore, if corrupt staff members tell players to vote in order to get prizes, these votes would be difficult to remove as you would not know which ones are the truthful ones.
I believe we can just stick to writing reviews XD. As I mentioned before, the system is abusable, but it can still be monitored to some extent.