Don't expect great things from the food - but for kid's - particularly boys - your son's ages, its a great spot.
Its cheesy monster movie trailers (like "Attack of the 50 foot woman") from the 50s, along with a lot of newsreel clips about our fantastic future from the same time period (we all cook with magnatism now!).
One word of caution is that its "drive in dark" and you'll sit in cars - we put the kids in the front seat and we sit behind them. So if your kids are sensitive to dark, cheesy monsters, or need Mom next to them to behave and eat - it may not be the best choice.