The show is about as good as a [insert whatever the word is for not-Japanese anime-ish show] can be but I really don't know if a live-action trilogy (directed by the increasingly self-indulgent and cinematically devolving M. Night, no less) is the right path for the... franchise? Series? Well, whatever it is, yeah, I'd heard about this before but not the fact that it was going to be a trilogy (though I guess it was stupid to not see that coming).
Going back the show itself, I'd just like to say that I got an idea for a (still-relevant) book and/or graphic novel series with a semi-similar setup sometime before when the show came out (it also retroactively bears some unintentional resemblance to The Seeker: The Dark is Rising, Dragonball, and Hellboy II, but that's a story for another thread).
BTW: Not to be rude, but I find it interesting that you linked to a page which clearly states the director's name and still twice misspelled "Shyamalan".