I have a recipe for spaghetti and meatballs that my mom got from a neighbor 40 years ago. Two pounds of ground beef (no other meat) 6 eggs, bread crumbs, parm cheese, garlic, parsley and salt to taste. The original recipe called for accent which I have used before and it does make them taste better in my opinion.
The original recipe called for browning the meatballs then ploping them into the sauce to cook all day. I started putting them on a baking sheet and baking them until just brown instead of frying then putting them in the sauce to finish cooking all day. I do agree with the posters who say don't over mix the meat. Also if you let it sit out on the counter for awhile before you mix it also helps. You should also let steak sit on the counter for an hour before you put it on the grill.
I think less is more, DUers always want to add a bunch of crap to food.