A lot of folk who are into anime are more loyalalists than anything else. They've decided they 'love it to bits whatever and everyone else should too'. Some are deluded by the realisation that not all films are as good as Akira. However, to appreciate anime properly you should know a bit about where its come from. Each film, not just the genre.
Below are mixed reviews, some are more honest than others. The art work in Detonator Organ is very old. The concept art is still way beyond our western art in terms of mecha style though, because its all still so new to us as a whole. However, the background art work and general direction is very very old. Infact its 'Battle of the planets'esk. The story itself is a little slow but very good and by the time the film has finnished you should be very satisfied.
If you're into quirky 'save the planet from certain destruction' and 'mech' films, you will love this film. If you're an art and design style guru wanting to explore the glory of modern japanese animation, then look somewhere else. Try maybe 'steam boy' or 'metropolis' or if you're really wanting cutting edge, try 'spirits within'.