I think Sandanista has at least a record's worth of subpar material, and I find London Calling much superior (there's that word again).
I like the RAmones as well but do not overestimate their abilities.
"Abilities" are not the point of the Ramones.
Two out of three ain't bad. I also like London Calling but cannot compare it to Sandanista.
Talent is the greatest factor in good music.