S - FNV, FO1, FO2,
A - N/A
B - FO:T
C - N/A
D - FO4, FO76,
F - FO3,
Personal ranking based on story:
1. Fallout 1
2. Fallout New Vegas
3. Fallout 2
4. Fallout Tactics
5. Fallout 4
6. Fallout 3
7. Fallout 76
Personal ranking based on gameplay (mods have swayed my decision)
1. FNV
2...