Back when I had my old Marlin .30-30 (I bought it off an old coworker I used to work with years ago), it originally had an equally old fixed 4x32 Glenfield scope on it. It was okay, but, just looked odd in my opinion.

Then by the next season, I had picked up a beautiful Savage .308 and had a Bushnell 3-9x40 scope mounted on it. To be honest, the .308 beat the crap out of the old .30-30 and did everything the .30-30 couldn't do.

So, I decided to remove the 4x32 scope from the .30-30 and hock it on eBay, along with its flat mount weaver ring/base. I kept the .30-30 with plain iron sights so I can use it for real up close, brush hunting.

If the Marlin .30-30 is the only rifle you have, then, go ahead and keep it as is with a scope. I've heard that some guys put a 3-9x40 scope on a .30-30 with see-thru rights, so they can maximize the range of the .30-30 way out about 200 yards, and also use the open sights if need be. The new Hornady LeverEvolution ammo is amazing from what I've heard.