Forget all the negative hype surrounding Valkyrie, because I assure you it is false. Bryan Singer has made a well-crafted thriller that kept me and my family on the edge of our seats until the end - even though we all know what the story's unfortunate outcome. Also, many tabloids were making this out to be the movie that would permanently cripple the career of Tom Cruise. This is entirely false. Cruise delivers a fine performance, and this hatred I can only assume is related to his rather odd personal life. Tom Cruise is as strong of an actor as he ever was, and I won't let something like turning Oprah's couch into a playground deny the fact that the man has talent, and is a truly passionate actor (and seriously, he does have a slight resemblance to Stauffenberg).
The movie is based on the last of fifteen known attempts on the life of German dictator Adolf Hitler (I'm sure everyone will have him in a nice "Five Most Evil People" list), and has Tom Cruise playing Colonel Claus von Stauffenberg, who of course was the key player in the assassination attempt. Ultimately this attempt failed (as we all know Hitler would die by suicide nine months later), but that doesn't keep Valkyrie from being an addictively engaging film.
Every member of the cast does their part well, not jockeying for superiority in any way. More importantly Cruise does not grandstand in this movie, fading in with the rest of the cast, rather than trying to stand above them like you'd expect, given his past films. Cruise gives a performance similar to 2005's War of the Worlds, where he does a good performance, but he never tries to overpower the other members of the cast. In Valkyrie Tom Cruise is a being a good team player, not trying to steal any glory, and never once does he overact the part.
Using very little CGI Valkyrie is also a wonderful film to look at. The vintage automobiles and aircrafts make this film have a distinct authentic flair that few other war films have (CGI looks like it was only used for the climatic assassination attempt). You can look at this and tell that this is the real deal, with the production team putting careful care into how they want this film to look, unlike most Blockbuster films that try and inflate every aspect of the film rather than aim for reality. Like the performance by Tom Cruise they don't try and overpower the audience with special effects, they simply let the characters slip into the realistic settings.
Also, the complaints about the accents I truly feel are desperate attempts to bash Cruise's performance. It was director Bryan Singer's concept to not use false German accents, and not that of Cruise, or the primarily British cast. I agree with Singer's concept that if feels false, and inaccurate to have people speak in English, but with foreign accents. I know several Germans in real life, and they do not sound very "German" when they speak in English, because the accent is not intended for the English language. I personally feel the desire for English being spoken in German accents comes from decades of WWII films where we've categorized every-single member of the German army, and by them speaking in that accent only is to cliché them and separate them from American audiences. They can speak in German accents, but only if they're speaking in German, because if they aren't it seems to be a tool to keep your common American moviegoer from relating to the characters.
Don't go into Valkyrie expecting to be greeted with a horrifically bad film that you will be able to poke fun at with friends. The movie has been released, and I feel the rumors, and negative hype of been proven decisively false. This isn't a movie to kill Cruise's career, but it won't help him regain love in the American community either (as previously mentioned he doesn't shine so much as mix in with the rest of the cast). It is a very enjoyable dramatization of a true event, and I don't think the material could have been handled much better, even with a full German cast, because Singer's style and method of conveying this story are all very well-done.
Go out and enjoy this dramatization of one of the darkest periods of human history. It is worth every second of your time, and all though it isn't Oscar-worthy it is certainly worth two-hours of your time.