My garden fizzle

Did you plant a vegetable garden this summer? I planted tomatoes, cucumbers, bell pepper, and eggplant. And so far it has not been a success. The cucumbers died on the vine, I got 4 tomatoes, 2 sad looking peppers, and no eggplants, yet. As tasty as these tomatoes above look, I don't think I'll be spending $3 per pound to try them out. I'm still hopeful for my little crop. If you have any secrets to your success please let me know!