Rankings can be biased and tough especially when you rank machines spanning four decades or more.
One example is BK which is ranked #62 on pinside.
I personally rank this machine very high and base it on my feelings while playing a brand spanking new machine in 1981. One guy that rated it a low 6 said the two lower flippers were almost dead. I am sure he wasn't getting the same rush that I experienced all those years ago.
The pinball industry owes a lot to the like of BK, MM, CV to name a few. Pinball was in the lowest of lows back in 1980/81 because of the video invasion. BK was released and the queues to play it were unbelievable. To have it sitting on #62 does not give it a ranking it deserves.
Pinside only has 3 pre 1990 games in the top 50.