This was something i was reading in a mag about games you can play online ,basically is nesscery? from my experience of the games that i have got i would definitely say yes the ones that usually it,i think it gives the games a bit more longevity.
take cod4 i have never played a game as much as i have this one if it wasn't for online play i would have played it twice at the most and that would have been it,so i think all games should come with online capability,thats if the developers can do that with each game and have time to obviously.