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I played a bit of hardcore back in D2, never much in D3 prior to RoS, though. I love the adrenaline rush, but when the inevitable happened, it was so boring to play through the earlier difficulty levels again, with zero risk, to get up to anything fun.
RoS changed all that with Adventure Mode and the new difficulty setting system. As long as you've unlocked Adventure Mode by completing the campaign once in hardcore (which is dead simple, on normal difficulty), the world is your oyster. Soooo much more entertaining leveling a new character when you can go anywhere, do bounties, do rifts, and tweak the difficulty setting to something genuinely fun and exciting to suit how twinked your new character is.
First thing I did when RoS dropped was level one of my softcore level 60's to 70 through Act V.. but since playing a little hardcore a couple of weeks ago, I've hardly touched my softcore characters.
Give it a try! Also, gearing up a hardcore character is a lot more forgiving since Loot 2.0.