Star Wars has been around 40 years. According to Box Office Mojo's Adjusted movie takings figures It had two immediate successes over three years, with ANH making an adjusted US Domestic gross of $1,631,575,500 and ESB making an adjusted US Domestic gross of $899,334,600 - in fact they're the 2nd and 13th highest domestic grossing movies of all time on adjusted figures.
Likewise ROTJ (#16) had an adjusted US Domestic gross of $861,584,200.
Jar Jar didn't even remotely harm Episode 1's takings (#18), with it making an adjusted US Domestic gross of $827,258,600.
It had its one bomb of Episode 2 (#97), taking in an adjusted US Domestic Gross of $489,771,200. Even then it still out-did the first two Hunger Games movies at #104 and #102 respectively.
It then recovered with Episode 3 (#67) making an adjusted US Domestic Gross of $543,413,200.
Then The Force Awakens shot up to #11 with an adjusted US Domestic Gross of $990,334,300.
Rogue One (#60) came in at an adjusted US Domestic Gross of $553,645,200.
For all its divisiveness, The Last Jedi (#43), bounced back with an adjusted US Domestic Gross of $619,169,000.
The worst offering in there, Episode 2, has an adjusted US Domestic Gross of $489,771,200 - just over $10,000 shy of that $500k mark on US Domestic figures alone.
Conversely the highest grossing Marvel movies, Avengers (#29), Black Panther (#30) and Avengers Ave of Ultron (#96), failed to reach the heights of even then Phantom Menace - with Avengers making an adjusted US Domestic Gross of $704,231,900, a good $124,000 less than it.
Meanwhile, Iron Man 3 (#113), Captain America Civil War (#123), Iron Man (#140), Guardians of the Galaxy 2 (#148), Guardians of the Galaxy (#172) and Iron Man 2 (#189), didn't even match the height of even Episode 2, with Iron Man 3 making an adjusted US Domestic Gross of $447,459,600 - more than $40k less than Episode 2. All the others didn't make the list.
In short, not only are both long enduring franchises and high earning franchises, but if anything it's not a case of Star Wars not meeting the heights of the MCU, but rather the other way around.