Hardwood flooring issues?

My hardwood floors are prefinished and are in BAD shape. We bought the house brand new and it would not have been my choice to put hardwoods in the kitchen, but they are and have been a huge source of frustration for 4.5 years now. They have a very high sheen/gloss and in the last year have begun to have these marks that look like scuff marks you could just rub away but they will not budge. At first I thought it was the soles of our shoes, but more and more I am beginning to realize the scuffs are from my son playing on the floor with toys. Is there anything I can do to get these scuff marks up. I have tried a tennis ball, mineral spirits, even charcoal lighter fluid (at the recommendation of a hardwood flooring specialist). I would really like to refinish them, but I am sure they cannot be. I am at my wits end and if I had it to do over, I would have never bought a house with so much hardwood. It is just not practical with small children.