We have played full 6 player games with NOs, techs and VCs every game, both 41 and 42 set-ups and both sides have managed to win in 41 and 42, so it can be done. We have a group that is a little older, has been playing A&A since the early days and we like to think we are fairly experienced. we usaully play to 13 VC as this is a long enough game and usually takes 10 hours to play.
All of our games have been won with VC, and Capitals barely are ever taken, only if you play to 15 VC; at 13 the Allies do not need a Capital if they get all the rest, and even the Axis can do it without taking US or UK, but must take either Canada or Moscow. Usually the Axis win when Russia falls. Usually the Allies win when either Japan is reigned in and outta Asia, or when Germany and Italy are overwhelmed and reduced.
I actually really like the NOs, the VCs, and the Techs. The techs have not been a deciding factor in our games as it still comes down to the best strategies and of course the dice have to be kind. 8-)