I enjoyed this movie overall, with some big issues to mention.
As a vehicle for some good re-enactment and action scenes, despite the low budget, it delivered. Good depiction of German small unit tactics at the time, and a surprising amount of authentic gear, vehicles, etc. The battles are for the most part not very large, but representative of small squad to platoon-sized engagements that were common throughout the war.
There were some very noticeable low-budget CGI firing effects for most weapons, but the quality of the sound design made up for it - actually some of the best sound design I've seen in a low budget war flick. Effects for specific types of weapons are very realistic, well- mixed, and sound exactly as they would sound in an open field, small clearing, or a thick wooded forest at the base of a mountain valley
To top it off, the filming does take place in several picturesque locations.
There wasn't much character development for all but a handful of the SS soldiers, and not surprisingly the writers chose to focus on an individual soldier who was not the most gung-ho Nazi to begin with, Herckel.
Despite his obvious dislike for Jews and a belief that they were primarily responsible for Germany's problems, over the course of the war Herckel loses faith in the strength and capability of the German war machine, as his unit faces repeated defeats at the hands of the Soviets. As time goes on, he slowly learns the truth about what the Germans were doing to the Jews, and begins to struggle with the SS' treatment of POWs, and internal battles with his conscience over what he is really fighting for.
Ultimately Herckel finds that the only thing he has left to fight for (as the title implies) is his loyalty to his country and his fellow soldiers.
The narrated diatribes at the beginning and closing of the film were really unnecessary, and as others have mentioned, the narration at the film's closing seems to attempt to whitewash the atrocities of the SS and the Nazi regime, and to compare the Holocaust to allied killings of POWs (which were already primarily in retribution for the SS' no prisoner policy) and the use of atomic weapons against Japan.
Without the closing narration, it could have been a solid low-budget WWII film. With them, it borders on neo-Nazi apologetics, and one has to wonder about the political leanings of the writers and producers at that point.
Don't bother watching the English dubbing, it's terrible.