I am new at PC games. I have played Unreal (the first one) and haven't been able to find UT yet. That was my first PC first person shooter game. I LOVED IT!! I finished the game in about two weeks.
I have found an online game that is outstanding. It is called Territories 3069:Star Siege :D
It is an online turn based strategy game. It can be addictive, so be careful!
Here is the link.

http://www.territories3069.com

Once you get used to the controls and how the program is working, it is nothing but megalomaniacal fun.
Check it out!!