Not saying he wasn't good, just don't feel the "great" that HOF deserves. There is no question he benefitted from the fact that he had zero competition on the ballot.
The game has certainly evolved, but Goose was never a big strikeout guy
(7.47 k/9 in career) and didn't have the WHIP associated with the dominant relievers (1.23 career whip).
His best year was arguably with the Padres (84 when they get smoked by the Tigers in the WS), yet he's remembered more for his Yankee days.
He was an utter failure as a starter as well, 9-17 WL, 3.94 era (pre-steroids) with the ChiSox in 1975.
Just trying to present a factual argument. In my opinion he was a very good, but not great player. That does not make a HOF career.