Call of Duty: Online

So, I understand that this is, at the moment at least (rumors have been spread that the servers are expanding), an Asian version of Call of Duty, but, it's free! My question is, is the game actually worth playing? I have slow download speed and it will take a while for me to download it, so I don't want to be disappointed at a game that took me quite a while to download.

how can we play online this game?