Robin pretty much hit the nail on the head with it is subjective and if you really want to get an idea about a game try and read up on it with people's comments, etc. The top 100 is a computer generated populated list that averages ratings, does the popular vote really indicate the best machines? No-too subjective-One man's trash is another mans treasure.
There will always be abuse-no way of getting around it. Some people despise Star Wars-some people think it is the best thing since sliced bread(including myself). All over the board, and people who abuse the system to try and change a position is comical(must be really bored).
If they decide to change the rating system and use a number base(with comment section) instead I feel it will be a more true accurate representation of Pinsider's true top 100. Like I said the way it is set up now really does not work. If a games art is not great but the gameplay is amaze balls-how do you get the position on top 100 you want? You have to fudge it and then the review is inaccurate and forced. Make it 1-100 scale and provide several genre categories and then you will be able to see what games other pinsiders prefer and what their true top 100 is. What would that do? Well over time you start to see pinsiders that you relate to and you see what their favorite games are. I have about a half dozen pinsiders that have very similar taste to me and I often check out their collections and ratings for insight. I have never considered top 100 to be accurate or viable when I am considering a comparison for a new pinball purchase.
Also had an afterthought how does one rate 100 machines if they have not played 100+machines? Well they just rate how many they have actually played but have to think about how they would rate them based on list of 1-100. If someone has only played 20 titles-then they rate the 20 titles they have played and can comment on. It will not be easy trying to rate your personal top 100-it would take some deep thought and consideration. When a new title comes along and it replaces another title in the 1-100 then a game drops off list and is moved to comment section-that is if there are any comments or ratings attached.