Untrained humans are indeed terrible, but it's not hard to learn. The main problem is that most people don't shuffle long enough, or use shuffling methods that

Untrained humans are indeed terrible, but it's not hard to learn. The main problem is that most people don't shuffle long enough, or use shuffling methods that don't produce enough entropy. If you use multiple shuffling methods, you can shuffle a deck reasonably well in less than a minute.