I don't really care for online play.. for me it's the exact opposite, getting good gear online is FAR too easy. While getting through the game with good gear in SP is where the real challenge is at. Mainly because you can't just wait for one of your friends to log in and help you out. You don't get rushed and you can't trade for gear. And most importantly no ones gonna save your @ss in a fight. Except for a few times when I forget to set the game, I always play on player 8 difficulty. And killing Durial, the ancients, and Baal's minions in hell can be VERY difficult if you got an incomplete character or without a tank. Not to mention that you can't use Atma online. I'm tired of making character mules and transferring crap online. Or having items stolen because I couldn't wait for a friend to log in and xfering in an open game. I admit theirs definitely something compelling about playing online with other people. But after years and years of playing. The only thing that has any hold on me online is dueling.
Well, Good Luck on bnet ^_^.