Pararaptor said:
If there's a single serious response in this thread in favour of your friend, I'll eat my hat.
Ok, just to see you eat you hat...
He is a retard, however, speaking specifically to Mass Effect. Multi-player would be dumb, but imagine if you could co-op with 2 friends. And instead of having mindless AI, you have friends controling you other party members? I think that idea is awesome.
Is that hat-eating-worthy? Shall I grab the salt?
But to the general point of the thread, no, not all games need multiplayer to be good. And I think the best example is Bioshock. A genra that is KNOWN for multiplayer, FPS. And someone makes an FPS with no multiplayer and it is critically praised and does very well. They go to make a squal and they try and shoe-horn multiplayer in... and the sequal suffered because of it.
And just a few more Single player games that don't need mulitplayer... Assassin's Creed, Prototype, inFamous, Dead Space, Mass Effect 1&2, Batman AA, Ninja Gaiden, Dragon Age, Fallout, Mirror's Edge... To name a few.