binau said: "If a film actor can’t remember the lines for an entire show, broaden their performance for the stage, be able to perform a whole show in one take, get nervous in front of an audience, project their voice, have the stamina to do 8 shows a week etc etc does it mean they are a ‘bad actor’? For me I think I just accept they are different mediums/different jobs rather than suggesting only the good ones can make it to the stage."
Well, no. But I guess if they CAN'T do those things they probably shouldn't accept a Broadway gig because the reality is they will be judged by stage criteria and will be deemed at the very least an ineffective stage performer.
Some of those things can obviously be overcome....microphones, earpieces, using alternates, using smaller venues....and the basics of skilled acting will get them through.
But the fact does indeed remain that the mediums are different. Broadway actors aren't always the best film actors, either, especially if their background is mostly musicals, because they have a hard time pulling back, just like some film actors don't translate as well to the stage.
Not everyone can be everything. It's ok.