I played the PC version of D3 a shitton and got sucked into it to the point that I had to quit. The social atmosphere of the friends that I had and the AH compelled me to repeatedly log in several times a day, and I couldn't justify doing that any longer.
Long story short, I got the PS3 version just before Christmas. As of today:
Main account's Paragon is 47 and my wife's is 27 (and this is thanks to what I do as explained below; she's actually played the game all of maybe ten hours tops). My main is a wizard that is at 500K dps (particularly thanks to help from another poster here, though I am ever so slowly replacing some gear as time goes on), and I also have a 350K barb, a 300K monk, and the DH is probably at least 300K too once I move everything over from monk (haven't had a reason to do it for a while). My wife's main is a 300K barb.
The new twist that compels me to play this version continuously is how easy it is to "multibox". Since the game has the mechanic of auto-teleporting off screen characters in local coop, all I need to do is have three other empty controllers sit while I do runs. So for key runs, as opposed to X% chance for one player for a key drop, it is X% of four players; same applies for XP gain, legendary drops, organ drops, and so on. With my wizard in XP gear and buffs, I use a socketed Andy's (that unfortunately has dexterity base), a HF, and a Leorics, and still have 477K sheet damage. That's enough for MP5/Master II. The build is a CM/archon hybrid where the four face buttons are ET, EB, DS, and FN; this means that any time I can lock a boss or elite, I can just use my right hand to thumb down all four buttons at once, which lets me use my left hand to move another character and apply more damage. Otherwise, the Archon just escorts the meat shields. With the DH troop I was able to get the two unused characters up to 200K health, which is awesome with the one passive that grants regen on the basis of maximum health. For barbs, the two unused characters are at 110K health with 11K armor.
Playing D3 solo still stands as incredibly boring to me, but at least the console version doesn't require other actual players to enjoy the benefits of MP. It's also quite more engaging to play the game for the purpose of developing several characters at once.