Sorry God, we've just killed it!
I, Tiberius Claudius Caesar Augustus Germanicus, The God, declare that Multiplayer is severed seriously by MP-system!
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Motivation for playing MP is generally missing.

An unavoidable diablo II comparison:

diablo II:
- several HIGHLY party-friendly classes (paladin, necromancer, barbarian), few semi-friendly
- rewards on experience and loot for playing multiplayer

diablo III:
- ONE semi-friendly class for party
- NO rewards for multiplayer, and until recently, punishments
- with 1.05, no Monster Power can be applied to multiplayer

Solution:
If The God needs to spell, then spell he will!

I EXPERIENCE in MP is rewarding
II LOOT in MP is rewarding, too
III Number of monsters is greater in MP
IV Monster Power is enabled

Only one thing need (some) explanation. Yesyes, +LXXV% per player. Bit easier, that's about it. And experience stays the same. Having less HP bonus replaced with greater NUMBER of monsters solves I, II and III at the same time - loot is bigger and experience is increased. Motivation for playing in group is finally there...
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This will draw people to MP - currently there is no need to play in group - but giving people REWARD for grouping - whole new experience. Sharing items (in-group playing). Cooperation. Forming a regular teams. The God feels there is no need to go further anymore.
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Only thing left for Blizzard folks to figure out is how to implement Monster Power - I, Clavdivs, The God suggest a choice between a) no MP, b) MP1 to MP3, c) MP4-6, d) MP7-10). Perhaps e) MP10 ONLY, for die-hard players. Or choosing preferred MP, and get into a game with bit higher or lower MP, when available. Like wc3 ladder. Whatever. Just do it.
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The God bought a game to play with his friends (speaking of which, The God has more than III), and what happened? Soloing LVIII% of time!

EXPECT THE EXPECTED - THE GOD FROWNS UPON A MULTIPLAYER GAME IN WHICH ONLY MULTIPLAYER ELEMENT IS AN AUCTION HOUSE - THERE WILL BE CONSEQUENCES.
© 2012 by Tiberius Claudius Caesar Augustus Germanicus, The God
Save Diablo III
by Tiberius Claudius Caesar Augustus Germanicus, The God