[Radek]

Seraph, do you want to tell me that you are selecting the spells as a complete newbie in BG2? That your only decision base is some kind of usefulness?
If I uderstand you well then being a "role player" means to pretend to be a newbie all the time. And, as far as that Kangaxx is considered, well, you can think that something special is prepared for you but how do you detect that you cannot pass without a +4 weapon? Let's be frank, Seraph: Kangaxx needs preparation. Twisted Rune needs preparation. Many other places in the game need preparation.
It's not me who is trying to make morons out of somebody. I want to emphasize that using your own experience is nothing wrong. Even if you know the game so well that you can find the optimal ordering of events and take advantage from every resource in the game, even then you aren't some "power gamer". You are a real expert in BG2, that's all. You should install some mod that makes the game more difficult so that the game becomes a challenge for you again, or you should restrict yourself so that the victory loses its easiness, that's all.