Quote from EntyQuote from BagstoneQuote from makaYour brain sure is squeaky-clean. "MP is not the focus of D3". Do you know that 80's song that goes "tell me lies, tell me sweet little lies" ? I think it's by Fleetwood Mac.
Jay Wilson (and others, just Google it, you can easily find lots of blue posts) said that everything will be able to solo-able. There are some nice things when it comes to group play, but every single aspect about the game is designed such that it is possible to complete it in SP mode (even uber events). Therefore I don't see how I would be "lying" if I say that "MP is not the focus of D3". Read: focus. Just because a game supports co-op, doesn't mean it's the focus (i.e., main aspect) of the game. There are several classes/builds that work even better in SP than MP.
Actually the game's focus is MP, I don't see how bonus EXP, MF, and GF for playing with friends isn't a reason to play MP or be MP-centric. The only reason the game is beatable on Solo is because then it wouldn't be fair if you couldn't find people to play with. You'd be shit out of luck if you couldn't beat the game solo. http://us.battle.net/d3/en/blog/9382478/#best This dev journal is all about how they can increase the MP experience, and yeah although it talks about how solo has its advantages and what not it is explicitly stating they want to improve the MP experience because that's what Diablo is about kicking the shit out of enemies with your friends. It's always been like that.
Actually mp is a bandaid and nothing more.