Knew I had this somewhere:
Brady:
NE vs STL: 145 yds, 1 td, 0 ints, 86.2 rating
NE vs Car: 354 yds, 3 td, 1 int, 100.5 rating
NE vs Phi: 236 yds, 2 td, 0 int, 110.2 rating
NE vs Gia: 266 yds, 1 td, 0 int, 82.5 rating
NE vs Gia: 276 yds, 2 td, 1 int, 91.1 rating
NE vs Sea: 328 yds, 4 td, 2 int, 101.1 rating
NE vs Atl: 466 yds, 2 td, 1 int, 95.2 rating
NE vs Phi: 505 yds, 3 td, 0 int, 115.4 rating
Montana:
SF vs Cin: 157 yds, 1 td, 0 ints, 100 rating *
SF vs Mia: 331 yds, 3 td, 0 ints, 127.2 rating*
SF vs Cin: 357 yds, 2 td, 0 ints, 115.2 rating
SF vs Den: 297 yds, 5 td, 0 ints, 157.6 rating
It's taken Tom 8 SBs to come up with 4 ratings of 100 or better. And in those four games he threw 12 tds against 3 ints vs Joe's 11 tds and 0 ints passing. Then Joe rushed for another 2.
Tom's highest rated game is the equal of Joe's middle and he never came close to Montana's ceiling.
The rules Montana and company had in play made the qb position harder to play and harder to play for anywhere as long, meaning both the short term and cumulative records are skewed in favor of the new kids.
Marino stood alone in the 5k club until those changes. And now it's comparatively crowded. It's simply easier to compile yards, easier to have a higher completion percentage, etc.
* notes qb also rushed for a td