Well. I just adored the 24 episode tv series, it is one of my all time favorite animes, it would be on my top 10 list, and I'm glad I've found other people who appreciated it. Very underrated. I've never heard anyone argue that it was not good on one hand, but people just seem to not have seen it. The X movie on the other hand is another story...
The series does an impeccable job of helping to bring to life a wide variety of unusual characters, everyone is so charismatic and multi-faceted. Not one person in the series is all evil or good, and I wouldn't have it any other way! Clamp has such a mature understanding of the human personality. X brings together some of my favorite characters from the glittering halls of anime. Fuma Monou being one. It also has my favorite relationships. My favorite couple is Yuuto and Satsuki. Subaru and Seishiro are another favorite couple of mine.
Yes you're right, about your critique, it had atmospheric music, sleek artwork that has stood the test of time, and will continue to stand. As for the story, I think they were off to a good start. Its very dramatic. But it starts to feel rushed to me at about 3/4 full. I think it needed more than one season. But it was still such a rich world. I don't know how I feel about the ending most of all. But I can't really fault them since the manga is incomplete. I think they were a little trigger-happy sometimes by taking the liberty of bumping off lots of interesting characters when they didn't have too, when they were still alive in the source material, but I understood-- they were trying to bring about a conclusion. I think they also had trouble explaining Princess Hinoto's character arc and Arashi's, but like I said, I think this was more of a matter of time, if they had only had more. But this is getting dangerously close to spoilers. All in all, it was special and I liked it. I love Clamp's work, they're my favorite creators!