The NT line never went tick tock (until Ballmernator fucked it up by merging with consumer which was fucking full retard, like consumers and fortune 50 customers want the exact same thing) because business was where their bread was buttered. the good ones on the NT line were NT 4 (after SP4), 2K, XP (after SP2), 2K3/XP X64, Win 7.
For those counting Win 10 in the good column? DO NOT COUNT YER CHICKENS BEFORE THEY HATCH, so far in the past 3 months I've seen 2 good builds and two shit builds and there is still a LOT wrong with Win 10. 1.- Like Win 8 there are areas where it hides needed controls from the user, 2.- the icons look like Windows 2, for why that is important see any article on visual feedback, 3.- there are still too many things where you are given no clues WTF it is, just look up how many services they have running with vague as fuck names, that is a malware writers wet dream, 4.- The performance seems to be all over the place, with one release its doing better than Win 7, the next its grinding the piss out of the HDD, 5.- The appstore? Needs to DIAF, its full of half assed programs, outright scamware, and what programs it has in common with the Apple appstore is often triple the price.
With Win 7 I heartily recommended my customers switch on launch, in fact I was doing Win 7 installs on launch day, but unless the Win 10 gets their collective shit together and irons out the serious issues? I'm gonna advise everybody to wait for at least SP1 or the 6 month mark and evaluate it then.