Unsatisfactory

The dishwasher my mom had in the '70s worked better than this! I rinse each dish before it goes in the dishwasher and yet after two hours of washing, I often need to run the dishwasher a second time because the dishes still aren't clean. Very often the dishes have a bit of a rotten-egg smell in addition to a greasy sheen and specks of dirt. I've only had this dishwasher for about six months and I'm very disappointed.