If you are not satisfied with your food, don't go and beg for the people food, just suck it up, and try to enjoy it. Remember, you could be stray, starving and sick. Be thankful for what you have. And who knows? Maybe your people decide to reward your honorable self-control and buy better food!
This situation is not limited to just cat food, it covers a wide range of things where begging seems the easiest thing to do. It might seem like it will change their mind (or make them give it to you to make you shut up), but you will most likely be put off the table and yelled at.
Remember, you should rule your own life, but not completely. Good rule of thumb: If you are being worked like a slave, you should speak up. If you are doing chores, pipe down. Hopefully this helped you in some way. I will get back to napping and grooming now. If any of you need help, don't hesitate to ask the cat.