This is a intriguing spy movie, mainly because it doesn't follow the formula of most other spy-films.
This is not another one of those films where the goody spies on the baddie, the baddie captures the goody, reveals his devious plans to annihilate the world, the goody escapes, kills the baddie and saves the girl. The strengths of those sorts of films are found in their special effects, stunts and a drawn-out battle at the end of the film.
By contrast, the strength of the Brotherhood of the Rose is its intelligent and engaging plot. A spy is double crossed and aims to find out why before they find him. The answers turns out to be a rather complex and very well-conceived conspiracy.
It's only downfall is its crappy production level. The sound quality, editing, directing and screenplay are noted areas requiring improvement. The acting is also inconsistent, but the brilliant Robert Mitchum, David Morse, Rhys McConnochie and M. Emmet Walsh offer fairly solid performances to ensure that the acting does not stand out as a major downfall.
Some cheesy lines and awkward acting moments could have been left on the cutting room floor. There also appears to be an editing error here and there (where a scene cuts before it appears to be finished). Furthermore, whoever chose the cheap and tacky music should have been sacked.
Aside from that, a very good watch. However, it is fairly long - 3 hours or so. Yet, I like a film that isn't impatient if the story is worth unfolding gradually.