vader will have 30 min screen time...i think most of it will be w/o his classic armor.then we will see him fall into the lava pit and well,ya know the rest...after that,he will kill all the jedi except for yoda and obie(in his armor).i don't expect much screen time from the classic vader tho...to the question itself,i want to see as much vader as possible...not some crappy five minute ish.
You're still looking at it from an offset point of view. Say after the whole thing's done, you show them all, in order, back-to-back, to some guy who's never seen them before.
If Vader only gets five minutes as screen time, that guy's gonna wonder why the hell this same dude is appearing in the next part. "How was he important? He was only in the last five minutes."
Look at it WITHIN the movies' order, and Vader needs to appear at LEAST for a third of the movie.
Good- nothing worse than a filmmaker making films for fans rather than for himself.
And I look at it in an offset way because that is how it is MEANT to be seen, GK. These films are all being made with the fact the OT has already been made in mind. It doesn't matter at all how it looks when viewed in order- nothing needs to be established at all, if that is so, other than that Anakin turns evil. The only reason you THINK it needs to be established is BECAUSE you have seen the original trilogy.
Your idea that a person watching them in order will wonder what Vader is doing in ANH strikes me as VERY odd indeed. I cannot see any reason why there would be any such problem at all.