I think the V-1 & V-2 projects were worthwhile. "Maybe" if Hitler had tried to use them more as a battlefield weapon than a terror weapon,could they have changed the outcome.
I remember asking why the V rockets were'nt used on D-Day a long time ago. They were'nt
accurate enough to hit the beaches.
Using them as a terror weapon did'nt bring the British morale down as Hitler wanted. I was under the impression that the Panther and the ME-262 were secret weapons but they did'nt change the outcome either.