The battle between life and death is what makes a game more interesting. If you are looking for a game that will generate your full potential, with a high level of difficulty, is realistically engaging, and will boost your bragging rights after every victory, the permadeath mechanic is perfect for you.
With most video games allowing you to respawn after your death, the gaming experience tends to die down easily making the game tasteless after a long time. This is the reason that the level of difficulty in the game is not nearly enough to satisfy your thrill cravings as death is only temporary.