When I first watched Andreas Schnaas' splatter-fest Zombie '90 (well over two decades ago: where has the time gone?), I struggled my way through with the original German audio, not understanding a word. I can't say that I enjoyed it that much.
However, in the years since my first viewing, I've developed something of a fondness for ultra low budget German splatter, learning to appreciate the sight of assorted mulleted Germans in stone-washed denim smashing papier maché heads full of offal.
As with Schnaas' first gore-drenched film, Violent Sh*t, the picture quality is cruddy, the sound lousy, the acting crap, the direction dire, the editing amateurish, and the gore effects thoroughly unconvincing, but I can't help but admire the fact that the guys behind the film have ploughed on regardless of their technical limitations. Every spurting wound, severed head, and eviscerated gut is a labour of love by fellow gorehounds, gawd bless 'em!
Rather irritatingly, Zombie '90 has since been released with an English dub, which attempts to add some unnecessary humour to proceedings by using ridiculous voices and silly dialogue; it does nothing to improve matters, being desperately unfunny throughout. My advice: stick with the original German soundtrack if possible: it's less insulting to horror fans.