Bert Blyleven compared to other HOF pitchers:
I'm going to take guys who won 300 games but had comparable stats. (Decided against it and went for Hunter)
Bert Blyleven:
22 seasons, 287-250, 3.31 ERA, 118 ERA+, 4970 IP, 1.198 WHIP, 3,701 K's.
Steve Carlton:
24 seasons, 329-244, 3.22 ERA, 115 ERA+, 4672 IP, 1.247 WHIP, 4,136 K's. If Carlton is in, Blyleven should be in.
Catfish Hunter:
15 seasons, 224-166, 3.26 ERA, 104 ERA+, 3449 IP, 1.13 WHIP, 2012 K's. If Hunter is in, Blyleven should be in.
When you take into account the era differences, the DH league, and the superiority of Blyleven compared to his peers, it seems fairly obvious to me that he's a hall of famer. This is strictly opinion though.