It is resource hungry?
It is the pacman of operating systems, windows 7 will be worse you wait and see. There was a point in time when memory was expensive, and operating systems considered memory and processor clock cycles as valuable resources. Now memory is cheap, and bigger and better faster processors are coming on the market, operating system designers don't give a damn about whats on the market today, they are designing everything based on what is available tomorrow.
Bill Gates once said "640k is enough for anybody", he was in fact talking about his salary
You can lead a person to knowledge, but you can't make them think.