A fairly consistent trend emerges from the ten entries so far that rank all five games:
Average rank (#1st, 2nd, 3rd, 4th, 5th)
1) G1: 1.6 (7, 0, 3, 0 ,0)
2) G5: 2.4 (2, 5, 0, 3, 0)
3) G2: 2.7 (1, 2, 6, 1, 0)
4) G4: 3.7 (0, 2, 1, 5, 2)
5) G3: 4.6 (0, 1, 0, 1, 8)
Additionally, people tended to cite the same favourite things about each game:
G1 - the atmosphere, story, characters, and freedom
G5 - the game engine
G2 - the factions and freedom
G4 - the game engine; the "grittier" plot received both positive and negative comments
G3 - people disliked the island/boat system and the story
What's interesting about this is that the results are WAY more uniform than when people have been asked to compare all the Avernums, or even just the three Exile games.