Reasonable advice, screenname notwithstanding.My 2 cents for burgers:
Adding beef fat makes the burger taste a bit more like beef. Since I eat almost all game meat, I actually prefer the burger on my grill have some beef fat in it. Go to a butcher to get some beef fat is not expensive. I do it about 15-20% beef fat for my burgers. The bacon route others mention is delicious, but not a classic "beefy" burger, which I like.
Ground meat that I use for everything else I do differently, usually some pork fat or no fat at all. Depends what I'm cooking (I grind them up and label them accordingly, grab the right package for what I want to eat).