*wonders if this is in refernce to his "lighter" version of Opeth thread*
As long as the lyrics aren't full of swearing(a little I don't mind to much), they are just badly written I do tend to mind, and it effects the quality of the music for me.
As for the tone they set, I prefer more netural, or "happy" frame for the lyrics, but I the other "downer" stuff is okay, it just probarly won't get as much play time as other stuff(even if I like the music/vocal style).
But I usually find myself placing a large amount of importance of the vocals, if they have 'bad' vocals I really find it hard to listen the rest of music(this also expands to bad lyrical writing) also yes, somebody who listens to largey screaming/growly type of vocals about vocal quality
In short: it doesn't effect my enjoyment of the music, it just effects how much play time it well get, and my over all feeling towards it--though I still enjoy it.