If he hadn't played for the cowboys he would be compared to Andy dalton. The ones that like him claims he was Marino without a team around him and the ones that hate him see him as an above average QB
Andy Dalton might be a very good comparison. He compares to a number of guys who were statistically good in the regular season, but have losing playoff records.
All Time Placement in Passing Stats (Career):
Passing Yards 29th - 34,1083 yards
Passing TDs 21st - 248 tds
Passing Rating 4th - 97.1 rating
Interceptions 88(tied) - 117
Yards per Game 36th - 219.1 yards/game
Yards per Attempt 6th (tied) - 7.9 yards per attempt
Completion % 5th (tied) - 65.3%
Intercept % - 31st (tied) - 2.7%
Touchdown % - 17th (tied) - 5.7%
4th Q Comebacks 14th (tied) - 25