I must jump in here and give NWN2 a shoutout (which used 3.5E). The base game was merely decent, but I personally think the expansion (Mask of the Betrayer) is a work of art. One of the best DnD stories to date, and by far my most favorite epic level campaign. You should try it out if you haven't had a chance to play it. The other expansion, Mysteries of Westgate is also worth a play IMO.
I agree that Mask of the Betrayer was a work of art. But it wasn't because of 3.5... it was because the writing was amazing. DnD 3.5 did its job I suppose, but the combat was just "okay" and probably would not have been worth the hassle if the story had not been so exceptional.