I DO like the WWII II Invaders stories, but I like many movies of and about the 30s and 40s. I'm not sure I agree they feel like an Avengers group, though. They aren't really a team when they show up in the present, so much as comrades in arms who are called upon by one of their own to help out.
I wouldn't go that far. There's plenty of stories of that era that could be told more 'realistically' like I think Paul Jenkins tried to do with ALL WINNERS SQUAD. Though, considering the sales on that mini-series, I'm not so sure Marvel fans are interested in that era.