For me, I really like them. Her performances are great without them, but they bring so much more emotion to the floor when you know what she's saying. For example, even without the subtitles, her Memorial Address live performance at Arena Tour 03-04 is stellar and emotional without the lyrics, but with them I just fall into tears.
If you're showing a live to someone else, though, I'm not sure if I like having lyrics or not. This is due mostly to the person focusing more on the subtitles than the actual concert. It's like watching a movie with subtitles: you have to put more effort into understanding what's being said, you you don't have the time to soak in the visuals.
