All Historical Dramas faithful to the actual events run the risk of being dry and boring. Fortunately, although it is a bit dry here and there, the producers of Valkyrie didn't stray too far in that direction. The story is well-told, and I did not feel that it dragged or got into excessive and boring detail at any point. If you are a student of WWII, and particularly this famous failed attempt to assassinate Hitler, you will be pleased with the quality of the film, the acting, and the film's faithfulness to facts and to the tone of the times. The film brings forth many details of which I was not aware, and the historical facts I know-of from past research are accurately portrayed.
It is clear computer graphics are used extensively in this film, since many of the scenes could not have been filmed in any other way, more than 60 years after events took place. The special effects are for the most part well done, and are not intrusive - clearly used only as needed to support the story instead of being an excuse to show-off a studio's CGI capabilities.
As for acting, this story was an excellent vehicle for Tom Cruise. I feel Cruise's portrayal of Colonel von Stauffenburg, who was a central figure in the assassination plot and this story, was excellent and believable. Some may argue that the characterization is a bit wooden, but I suspect this may be intentional on Cruise's part, and in keeping with the historical figure: a decorated soldier filled with anger towards Hitler, who could survive in the upper levels of the German Army only by masking his true feelings.
The rest of the cast is phenomenal. I was amazed at the number of familiar and respected actors and actresses that appeared in relatively minor roles throughout the film. Not a single performance was less than I would expect from such a cast.
The film is not a light-hearted one, nor does it end well for most of the characters. There are several bloody scenes, but none of the violence is gratuitous. As such, this is a film that will be appreciated primarily by those interested in the history of WWII, or are solid Tom Cruise fans. I am well pleased with the film as a whole, and feel the end product meets the goals of both the producers and their intended audience.