Just over 2 months ago I bought SH3 (Which I luv)

, I have been reading and hearin about DW since than too, and I have grown an interest in it. Just a few questions,
Can you still get it?
Is it set missions, eg You don't pass A well you have to repeat the same mission?
Which do you get more value out of, Multiplayer or singleplayer mode?
I know I sound like an interagotor but there are alot of games out there that can bite your pocket for no reward.
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\"If man is called to be to be a streetsweeper, he should sweep streets even as Michelangelo painted, or Beethoven composed music, or Shakespeare wrote poetry. He should sweep streets so well that all the hosts of heaven and earth will pause to say, here lived a great streetsweeper who did his job well\"
Martin Luther King, Jr