It sounds like you're a console gamer by the "stick to PC's comment. That strongly suggests that you never played D:OS 1 at all.
So what did you do? You jumped right into an unknown game on the ultimate difficulty, the one which has the same features as Tactical difficulty, except with permadeath. You, someone with no experience with the game at all, you, who chose to play on a mode with permadeath, are complaining that you were not able to blindly rampage through the game on the hardest-difficulty-mode-with-permadeath and beat it on your second try.
You are an idiot.