United finished 19-points behind Guardiola's Manchester City side as they romped to the Premier League title in record-breaking fashion.
While Mourinho was subject to severe criticism after splashing £147m (R2.5b) on new arrivals but ending the season trophyless with a rigid style of football.
Despite Scholes acknowledging, the Portuguese manager is driven by results, he claims the Theatre of Dreams would be witnessing a different Red Devils outfit had the Spaniard been in charge.
"(Mourinho) doesn't look happy to me," Scholes told beIN Sports. "As a football person, if you're a coach and you seem your team playing - he may be happy.
"It's a team who grind out results rather than really impress you - and that’s probably what he is happy with, that’s where he has been at his best all over the years.
"If Guardiola was manager of Manchester United he would hate what he was seeing - and it would be different. But, the most important thing to (Mourinho) is results, he will be judged on that.
"Last year was a disappointing year, not to win. You don't have any divine right to win a trophy I know that.
"But the performances in the league weren't of the standard required, they got beaten by Sevilla in the Champions League - and they are a poor team.
"Every year when Manchester United doesn't win something it is a disaster."