We all have our own personal opinions especially on pins we feel as under rated (in your opinion).
I will start, there are a few that I believe could be in the top10 but are not even close in the actual ranking.
Here are my candidates that could be in the top10 (and currently rating).
BM66 (26)
DI LE (28)
TWD (34)
WoZ RR (36)
Tron (39)
SW premium (48)
I was going to put DI as my pick, but went with the SW premium, can't see why it's actually so low and my pick to replace MB (5) on the top10 list.