I have to say, I was quite apprehensive of H20 at first. The title turned me off, and the idea of three girls going all aquamarine was gag-worthy.
Yet when I started watching the show I was enthralled by the pretty pretty tails and Rikki's sharp wit and attitude. Oh joy! someone intelligent on television! (Though I was kinda turned off by whiny Cleo and stick-in-the-mud Emma)
Of course, like all live-action teen shows it was centered on love, friends, loyalty yada yada... but what made it all better was the awesome effects! (ooo.... water bending....)
It was a younger version of Charmed (remember that power of three stint?)
The show grew better and season 2 was a blast. Cleo and Emma got was more interesting and the story line got better.
Hopefully season 3 won't start detoriating, and Rikki's wit gets sharper and Cleo and Emma won't stay so 2 dimensional. (I love them drunk on the moon)