well, it is understantable that both animes (klk and ttgl) have a slow start and they try to catch you with simplistic plot, but that is their point (trigger animation). they always start slow to pretend that the plot will be linear and have some peaks time to time, but the awsomeness in both above is that when they got to the first peak, they explode and go shit out of f(x)=x^³, and it is simply amazing how the end will be nothing that you were expecting and suprises you the best way possible.
i agree that fma sounds childish, but that was because of the animation company, the manga shows a way more mature prespective.
well, if not my top ten and you haven't watched yet, i would recommend Madoka Magica (obscure, witchcraft, mysticism), sayonara stetsubou sensei (comedy, drama), ninja slayer (because yes), Higurashi no naku koro ni, noir, lain (this one took me years to understand).
and if you have time or interest, you should play muv:luv and alternative, best plot ever
took to long cause was searching on MAL, sry