Re: How much do lyrics matter to you?
It really depends, some bands can get away with bad/silly lyrics. Into Eternity is a great example:
"Separate the anguish, separate this fear
separate from sadness, now I see things much to clear"
Looks like something a 13 year old would write over his first breakup but the melody is so much fun to sing along to that I just don't really care.
Other bands I really need the lyrics to get a full appreciation of the music, Agalloch and Pain of Salvation are fine examples of this. Punk/hardcore music in general puts emphasis on the message of the lyrics than the musicality so I pay attention accordingly.
In death metal and heavier types of music with distorted vocals, sometimes the lyrics take a backseat and just serve as another instrument to complement the rest of the band, but as always, there are some solid exceptions, Lykathea Aflame's Elvenefris is a brutal death metal album (with amazing drumming) with great lyrics about finding our inner selves, helping others and generally being happy (I'm being completely serious) and August Burns Red (a Christian metalcore band) pens great hymns about their positive beliefs in a not preachy, condescending way. In both cases you can't understand a word they're saying but looking up the lyrics really enhances the overall feel of the music.
In any case, I love singing along so I almost always look up the lyrics to all the music I enjoy.