Search found 3 matches: Jack Lemmon

My top 10 is quite surprising to myself:

1. The Marx Brothers 8.60 (10)
2. Peter Lorre 8.40 (10)
3. Thomas Mitchell 8.30 (10)
4. Natalie Wood 8.30(10)
5. Anthony Quayle 8.25 (12)
6. Humphrey Bogart 8.22 (23)
7. Daryl Hannah 8.18 (11)
8. Mia Farrow 8.17 (18)
9. C. Aubrey Smith (Who???) 8.10 (10)
10. Marlene Dietrich 7.36 (11)

Conclusion: Actors with exactly ten or eleven films benefit. Actors with a lot of supporting roles in classics get an excellent score.

This is the result with a minimum of twenty films:

1. Humphrey Bogart 8.22 (23)
2. Scarlett Johansson 7.86 (28)
3. Ingrid Bergman 7.71 (21)
4. Cary Grant 7.36 (28)
5. James Stewart 7.29 (24)
6. Gene Hackman 7.19 (21)
7. Shirley MacLaine 7.00 (20)
8. Jack Lemmon 6.95 (21)
9. Sean Connery 6.89 (27)
10. Donald Sutherland 6.86 (22)
11. Fred Astaire 6.77 (22)
12. Al Pacino 6.75 (24)
13. Woody Allen 6.67 (39)
14. Mel Blanc 6.61 (33)
15. Louis de Funès 6.59 (22)
16. Robert De Niro 6.58 (31)
17. Dustin Hoffman 6.55 (22)
18. Gérard Depardieu 6.52 (23)
19. Nicole Kidman 6.47 (32)
20. Oliver Hardy 6.40 (43)

Now this is beginning to look like a best actor list!

1. Thomas Mitchell - 78.18 (11 films)
2. James Stewart - 75.91 (22)
3. Burt Lancaster - 75.00 (12)
4. Raymond Massey - 74.00 (10)
5. Lionel Barrymore - 73.64 (11)
6. Lauren Bacall - 72.92 (12)
7. Jack Lemmon - 72.86 (14)
8. Claude Rains - 72.31 (13)
9. George Sanders - 72.14 (14)
10. Humphrey Bogart - 71.74 (23)

...and a second list for living actors. Interestingly, the ladies fare considerably better here.

1. Frances McDormand - 69.09 (11 films)
2. Joan Allen - 68.46 (13)
3. Juliette Binoche 67.27 (11)
4. Woody Allen - 66.96 (23)
5. Sissy Spacek - 66.67 (12)
6. Cloris Leachman - 65.91 (11)
7. Diane Keaton - 65.63 (16)
8. Ethan Hawke - 65.36 (14)
9. Hugo Weaving - 65.27 (11)
10. Angela Lansbury - 65.00 (10)

This is easy for me:

Jack Lemmon (67.90, 10 rankings)