It makes you wonder about spoilers when dealing with historical events—did people already know how Operation Market Garden played out, or are we making assumptions about general knowledge? It’s possible that not everyone is familiar with places like Arnhem or Antwerp, and even the basics of World War II. Of course, the Germans were involved in all of this. The film seems to include practically every significant person from 1977, and it looks like almost the entire Hollywood scene was dedicated to its production, even featuring well-known actors in smaller parts. Knowing that, you expect the performances to be strong—and they are, as is the directing. At least the direction is about as good as you could hope for given how much story the film tries to cover at once. It’s a really good movie; when it's called "Epic," it truly means epic in terms of scale, and it manages that scope remarkably well and with clarity. My main concern is that very scope. Market Garden was massive—a huge failure, a major disaster, a significant event, and a large airborne operation—and the film tries to cover every aspect of it. This makes things feel somewhat stretched out. If the movie had been six hours long, they might have been able to do it perfectly... but who would want to watch that? Still, you can’t really fault the outcome. It's not as bad as it could have been and is better than one would expect from a film of this size. They accomplished something impressive. I just wish they had ended things with Montgomery’s infamous statement—"Operation Market Garden was 90% successful"—leaving the situation unresolved, showing a general attempting to deflect blame.

Source on TMDB