That's what smoothies and banana bread are for! :)
Hvem har tid til middelmådige bananer?
Hmmmm...were they too green, too ripe, too mediocre?????!!!!! Mediocre....interesting word choice
I'd say it's mediocre at best.
Hva er en middelmådige banan likevel?
You'll know it when you taste it.
Jeg hater middelmadige bananer...
Middelmådig sounds kind of old-fashioned and a little snobby. If I was gonna say something was mediocre I'd say it was okay/good enough. "Bananene var ok/greie nok" (though I guess it depends on dialect like everything else)