This show is great! I don't understand what so many people don't like about it. The animation is very impressive, the characters are well developed, and there is a great romantic plot twist late in the series.
The characters are all really lovable, and the Angels are fun to root for. By the time you're done with just the first few episodes, you'll want an Angel of your own.
The romantic struggles, such as Misaki's confusion between Ohjiro and Kotaro or Tamayo's secret crush, are all amusing to the girls who enjoy the series, while the boys watch it for the plentiful action.
Like I said, what isn't there to like? It's well-developed, has a happy ending, and hey--it's CLAMP.