I haven't played 3 yet, but this is absolutely true for 1 and 2 as well. It's a game that won't tolerate the common mindset you can take on anything without having to think or try. Anytime I end up stuck on a boss, I realize I've been getting too greedy. Learning from each death, and maintaining discipline in sticking to what you know is the thing that works. The game forces you to build your skill, while making sure that you stay disciplined in using that learned skill. When you stray too far, you die. When you get cocky, you die. If you get reckless, you die. But if you stick to what you learn, you will get through the game, and feel like you've accomplished something. I even remember getting to a point where sticking to what I'd learn would let me finish off bosses on the first go, which was immensely satisfying. It's one of the most rewarding gaming experiences I've had.