Here are my season rankings. Some biases might be in play. Including all of the spin-offs as well.
1. S21 - Rivals
2. S13 - The Duel
3. S24 - Rivals II
4. S25 - Free Agents
5. S20 - Cutthroat
6. S8 - The Inferno
7. S10 - The Inferno II
8. S12 - Fresh Meat
9. S17 - The Duel II
10. S19 - Fresh Meat II
11. S33 - War of the Worlds
12. S30 - XXX: Dirty 30
13. All Stars 3
14. All Stars 2
15. S29 - Invasion of the Champions
16. S14 - The Inferno 3
17. S11 - The Gauntlet 2
18. S7 - The Gauntlet
19. S22 - Battle of the Exes
20. S26 - Battle of the Exes II
21. All Stars 1
22. USA 2
23. S15 - The Gauntlet III
24. S31 - Vendettas
25. S34 - War of the Worlds 2
26. S32 - Final Reckoning
27. S36 - Double Agents
28. World Championship
29. S38 - Ride or Dies
30. USA 1
31. S28 - Rivals III
32. Australia
33. Champs vs. Stars 2
34. S6 - Battle of the Sexes
35. S5 - Battle of the Seasons [2002]
36. S9 - Battle of the Sexes 2
37. UK
38. S27 - Battle of the Bloodlines
39. S35 - Total Madness
40. S18 - The Ruins
41. S16 - The Island
42. S37 - Spies, Lies & Allies
43. S2 - Real World vs. Road Rules Challenge
44. S3 - Challenge 2000
45. S4 - Extreme Challenge
46. Spring Break Challenge
47. Champs vs. Stars 1
48. Argentina
49. Champs vs. Pros
50. S23 - Battle of the Seasons [2012]
51. S1 - Road Rules: All Stars
NOTE: Some of the seasons towards the bottom were missing episodes when I was watching them and I never bothered to re-watch them. Examples of this include CvS 1, CvP and Argentina.
Mackey I felt like the season was ruined by the editing out of Dee that happened in the back half of the season as that took out a good chunk of Jenny and Rogan's storylines as well
Tester I mean yeah but the drama, was so good and the elims were so good also there were beasts in the season?? Like when I had to pause/go to bed while watching I was upset idk maybe just me