I found this place fascinating. Yes, it stinks of cat piss. Yes, it's relatively expensive. Yes, there's lots of silly irrelevant content. Yes, the toilet's disgusting. Yes, there's no real information to inform anyone about what they're looking at. Yes, the pictures in the display boxes are entirely unsuitable for children, and there are no warnings about this. Yes, it's not clear which trenches are which - and it would be particularly useful if there was more information here.
However this museum has a massive collection of material and some well preserved stretches of trench line, and offers an experience rarely found in other places on the Western Front. Customer service may not be a priority, that's for sure, but it's got material you won't see anywhere else. All the reviews here are basically true, you could give it five stars or one star and you wouldn't be wrong. Properly managed, it could be an amazing place. As it is, if you already know a Mills Bomb from a Pickelhaube you won't mind the lack of info. Just be forewarned of the cat smells ... and whatever you do, don't stay for the food.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.