It also depends on your expectations.
If you are expecting to grow corn you get from farmer's stands with fully filled rows and rows of sweet corn kernels, then you probably need to give the plants plenty of room and plenty of fertilizer and plenty of water, etc.
If you can be satisfied to see your kids, super excited to find 6" scantily filled corn in the garden, jump up and down that we eat them right away, then pronounce them "GREAT!" and declare that the unfilled/undeveloped tip of the cob tasted sweet and was even better than the kernels, and fight over who got to eat the next one, then... well, you get the idea.
Next year, when you strive to do better, and you get bigger better yields, and your kids ask that we grow corn every year, you can start experimenting. I still can't grow the big farmer stand corn, and I don't have enough space to plant a big enough block unless I sacrifice growing something else. But my hand pollinated (I gently shake the tassles -- and the cloud of pollen -- over the silks every morning after the dew dries) little ears are getting more filled, and the kids still fight over the sweet unfilled cob tips.