This game is a classic that you need to play.
In the begin when i had the game i played campaign from easy to difficult nightmare.
The campaign was nice it doesnt has a story for me but its great.
Then i started capture the flag or team deathmatch (single player) but that is getting boring after a while.
then i tried to play it lan or on internet with friends only that was amasing!
Then i started online on servers its great that there are anti camper servers but its getting a rambo style.
The weapons are great.
but now there are almost only rail gun servers that also fun but not realy my thing.
Mods : they are screawing the game.
many skins to choose and if you want you can get a costume skins they are great.
there are enough maps to play online.
I say the game is it worth plaing :)