I haven't done 80 Heroics yet so I can't comment, but from experience so far normal mode instances 70-80 have been easier then 60-70 (thanks to our new 3.0 powers). I could clear UK/Nexus with far more ease and speed at 71-72 then I could ever clear slavepens/UB at 63-64 (pre 3.0) for example, nova stuns and TS have made all trash pulls trivial... adding hex at 80...yeah, I believe HM trash at 80 will be a complete joke with our new arsenal. That just leaves the bosses, based on what ive done so far and looking at their HM hitpoints I don't think most of them will be a big deal but thats just my theorcrafting opinion at this point, if you just want some badges everyday from 5mans im sure theres going to be a set of joke bosses to farm