I picked the game up yesterday during my lunch break, but I'm in the middle of a fairly busy week so I've only had time to play the first mission and a half. I'll devote some time to it this weekend. I do love playing the campaign, but I can't wait until I finish it and start back up with the multiplayer.
I main Protoss, but I ended up quitting SC2 a few months ago due to just how boring the race is to play. I was pretty good at the game (Masters level), but it was just so tedious. I did enjoy PvT, but PvZ was broken and PvP was the most god awful tedious crap I've ever had the misfortune of sitting through. The Mothership Core and the Tempest should do wonders for me and my Protoss brethren.