Originally Posted by Jk
but is there any major reasons that I should keep it?
first of all, like you said it's fast and simple. Those two things alone make it a great os for everyday stuff. You also mentioned free software, and that is something HUGE. With linux there is free software for pretty much everything.
Also, it's open source. So the freedom you have when changing things is..well.. you can change EVERYTHING since you can freely access and modify the source code.
Then there is security. Let's face it, linux is probably the most secure OS in the world. Don't need to worry about getting a virus/spyware and, as proven by the pwn2own competition, ubuntu 7.10 it's safer than windows vista or mac OS X v10.5.
Yes there are some problems with installing certain programs and games, but often you will find a (free) alternative for the program and most games work with wine. But there will be problems with games untill the game developers start to create games that are compatible with linux.