Gentlemen (and Ladies),
Being on military leave while waiting for orders is boring as fuck. It gets you doing nothing during the day because friends are all working (because that's what normal adults do), so I figure I try out Diablo III again after playing in June-ish.
First off, they changed a lot. They added this shit called "Monster Power" which boosts the mobs to insane power but gives better exp and drops. They also added 100 new levels so now your level cap is 160. Shit crazy.
Regardless, I was under-geared...like very under geared. So I tried out the real money to gold on the AH, and go figure one dollar gets you about 4 million gold. 4 million gold is stupid good for passable gear to get you through the game on Inferno.
I was able to solo MP3 without much trouble and in groups I can tackle on MP6-7, I tried MP10 with random people and they just spent the game raising me after each fight/boss.
So, if you're working and have responsibilities like all sane adults, it's a cool idea to spend a buck to get good gear and try the new shit.
If you want to get back into Diablo III and be willing to part ways with a bag of chips or a twinkie or even an iOS game...it's pretty good idea. Buy basic gear to get through the farming and then farm you good gear from there. It's still fun.