Vocals don't bother me. Admittedly they are somewhat hardcore, especially when you're expecting some generic ultra-guttural vox, but I tend to just think of them as 'aggressive' vocals. They do, to some extent, portray more energy than guttural vocals, but I suppose they're arguably at a juxtaposition with the technical death of Capharnaum as opposed to being in harmony. I definately think a deeper vocalist would fit-in better, but as it stands they're a good band. The music has a fair bit of drive and it feels like it's going somewhere, as well as being technical and having good riffs.
Vocalist actually reminds me of Kyle Symons from Malevolent Creation, who pulls-off this vocal style far better. He'd fit right into Capharnuam.