I’ve never seen a bum make a pro bowl…..
Then perhaps you've never heard of Elvis Grbac (lifetime NFL completion percentage under 60%) or Matt Cassell (also under 60% lifetime completions), both of whom were pro bowlers during their NFL tenure.
Are you aware that Tyler Huntley of the Ravens was a Pro Bowler last year, while starting 4 games, during which he averaged an almost incomprehensible 118 yards passing per game, with 2 TD and 2 INT in those 4 starts?
Or how about 2006 Pro Bowler Vince Young, making it on the strength of this amazing stat line:
51.5 completion percentage, for 2199 yards, with 12 TD and 13 INT.
Amazingly, Young put together another Pro Bowl nominating season in 2009
Of course, by then he was far more accurate, completing a scintillating 58.7% of his passes for 1879 yards, with 10 TD and 7 INT.
Oh, and don't forget Kordell Stewart in 2001, getting in on the strength of a fantastic 60% completion percentage for 3100 yards with 14 TD and 11 INT.
Took me about 3 minutes to find those examples. There are plenty of others.
that doesn't even cover defensive selections that were made either on previous reputation or on being on a popular team who won a lot of games.