sub par for him maybe in those years but not in comparison to the rest of the qbs.
2007, his last year in GB he was top 5 in most qb categories.
His year with jets, his worst, he was top 10 in all categories and was 8-3 until he tore his bicep
Then made the NFC championship in 2009 after retiring.
He had 1 average year.
He is justly rated: nobody calls him the GOAT. That is usually reserved for Brady, Manning, Mahomes, Montana (for big wins)
Favre comes in as top 5-10 qbs ever in conversation and that's exactly where he belongs.