skirmish mode is best suited to train for online imo.
its just like online multiplayer but it uses just bots.
lest say if you pick 10 players, it will be 5 vs 5
its very good and enjoyable kinda like the bot matches in unreal tournament.
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if you like shooters then i recomend killzone 2, its quite difficult online, seems to be a more of a skilled player game. some may be put off but i love it.
...not much time to post anymore, used to be awesome on here really good fond memories from VGchartz...
PSN: Skeeuk - XBL: SkeeUK - PC: Skeeuk
really miss the VGCHARTZ of 2008 - 2013...