What do you consider too much dietary fat? If you are advocating a low-fat diet you are misinformed. Dietary fat is fantastic for you, especially oils such as flax seed oil and olive oil, and other foods such as almonds and fish, etc. Most people (at least americans) would be served well by eating far more fat and protein and far fewer carbohydrates (adding good fats, and removing refined/high glycemic index carbs). The people who suffer because of "high fat" diets are actually probably suffering from the insulin rollercoaster and massive fat gain that high sugar/refined carb intake has caused. Typically its also far easier to over eat with high carb diets, they are far less satiating than fatty/high protein foods.Too much fat in a diet is bad, everybody knows this. Even if it wasn't bad for athletic performance, it is bad for your heart.
An ideal diet would be composed of high nutrient density fruits and vegetables for complex carbs, lots of good fats, and as much protein as you need for your goals.