I think the Temple of Elemental Evil has suffered from time. It was good back then, but has not aged very well.
Pillars, yes, every fan of CPRGs needs to put them on their wish list, at least 2. 1 was too dark for me. Wasn't bad, but god was it depressing at times, at least until you got to the White March DLC that freshened things up a bit. I love the setting for 2, your home base is a ship and you sail the seven seas in search of adventure, finding new lands and monsters and shit. Loved it. But as a lover of turn based game, I was not too happy with the implementation in 2, so it's one of the few games I favour the real time combat.