Competitive as to actually threathen Reagan?
No. Me might not even outperform Mondale. Hart was a bit of empty suit. If Reagan was able to humiliate Mondale as a political dinosaur, he would have easily destroy Hart as a shallow amateur.
The irony is that Mondale was both an out of date New Dealer, whilst also being 'youthful and inexperienced' in the words of Gipper.
If Mondale ( a rather average pol) could take apart Hart with three words (Where's the Beef) it doesn't say much for Harts skill
The "youthful and inexperienced" line was a joke, given that Mondale was clearly neither.
But it did work, didn't it?
If Mondale was able to own Hart with "where's the beef?", imagine what would Reagan do.