Impartially:
Dirty Harry
- Current Pinside rank: #87
- Current IPDB rank: #198
Judge Dredd
- Current Pinside rank: #43
- Current IPDB rank: #21
That's quite a variance, probably owing to the difference between Pinside and IPDB formulas for the final score. Also, it seems that IPDB reviews must be approved, so IPDB is updated less often than Pinside and for that reason may discourage submission and thus may represent a smaller sampling of players.
Say what you will about the rankings, but I find the rankings to be roughly correct. For example, very few people would call out any of the top ten machines as bad.