I started watching FLCL knowing of all the hype surrounding it and after seeing it, I know why it has such a strong fan base. Unfortunately it just didn't work for me.
FLCL is highly abstract anime. I personally love shows, which make you think. The problem with such level of symbolism as FLCL has starts when you are unable to grasp what it tries to say. I have to admit, that I have probably missed 50% of the points FLCL tried to make and regarded them just as a visual try at originality.
In fact FLCL's visuals are really original. It ranges from simplicity to diversity and animation is smooth. And it is quick, quick as hell. It is a complete opposite of slow-paced shows. That worked both ways for me, it made it presentation quite original, but hard to follow at times.
Having read sothis' review, I must say that FLCL's repetitive soundtrack wasn't as much of a problem for me. That is probably because I watched it slowly for a few weeks, those songs were not in my mind when I started next ep. I enjoyed the guitar and think it suited the animation style.
I am sure a lot of people will love this show, but I am not one of them. Without understanding it completely, it is below average.