As much as I try, unless I can get the gist of the meaning of the words I feel like I'm missing the point of the song.
I'm somewhat of a wordsmith, so knowing or at least having some understanding of the words is important to me. I'm only truly fluent in English, but can understand some Spanish, Italian, Portuguese and French.
Music from other places can be fine in instrumental form, but when I'm hearing words I don't understand it bothers me a bit. I agree that music is universal, but I just can't seem to appreciate it quite as much when there are words sung in a tongue that's totally incomprehensible to me.