French Montana on Super Bowl Opera Singer -- 'F**k That Sh*t'

Not everyone's stoked about the opera singer who's booked to sing the National Anthem at the Super Bowl ... especially rapper French Montana who tells TMZ Sports, "F**k that sh*t."

People have been divided about the decision to have renowned soprano Renee Flemming belt out the anthem before the big game on Feb 2 ... and Montana says he understands it's important to try something different.

But at the end of the day, French says he's entitled to own opinion ... and his opinion is that opera music SUCKS.