Okay so I took a look and of my 50 built characters (most of them level 50), 32 has Hasten and 18 did not so that's roughly 66% has Hasten. Masterminds without exception did not have it and most of my melee toons didn't either except for my kick fighter who I love fast fighting with. All Doms, Controllers and Defenders had it as did all but 1 Blaster. I don't make "teh ubar" builds to take on AVs or EBs solo so I have more room for "fluff" powers, ones that are truly necessary but make things flow better. Characters that are team oriented (heal, buff, debuff) definitely need it in my opinion because the more you are doing that thing, the more you are helping, even if the team may or may not need it.