Farve and Romo had some similarities... Their highs were high, but their lows were low. Farve could win you football games nearly single-handedly, but he could [and would] occasionally also lose them for you. And that type of variance tends to look good in the regular season but hurts in single-elimination playoff scenario. Farve managed to get a ring, while Romo did not, but even a blind squirrel finds a nut every once in a while.
Farve holds [by far] the record for most interceptions thrown in a career. And it's true, he has a LOT of pass attempts, but it doesn't scale linearly. Drew Brees today has only about 4% fewer career pass attempts than Favre, but has over 100 fewer interceptions thrown. Nobody on a roster today looks like they'll have a chance of catching Favre's interception record.