That’s really common, especially on Martins. Martin is known for being THE guitar for bluegrass backup chords, and a lot of people bang the heck out of their strings. Under those circumstances, an action that’s too low will cause the strings to buzz, so Martin leaves the action higher than what I’d choose for myself.
If the nut slots could use some filing down, it’s almost a guarantee you can have the bridge lowered, too. Doing so will probably make your new baby even more enjoyable to play.