GAOG was a good album, very focused musically, and features the clearest concept of any Manson record so far. That said, it totally misses my tastes. It's heavier than I like my music and I loathe the overly (imo) clean production. So I understand why it usually ranks so high in the eyes of Manson fans, and I think it deserves to, it just sucks for me that I don't happen to like it.
EMDM made me laugh so hard when I first heard it. I thought for a second "Oh lord, Manson done sold out and went emo." By the third or fourth track I laughed even harder thinking "no, he's totally being sarcastic." Really, I still think that. People had labeled what he did beforehand in a lot of different ways, that weren't necessarily true. It felt to me like he took every misconception about himself and what he did, and actually made the kind of album that people had thought he'd already been making. To my mind, it was the most unexpected release since Mechanical Animals and I found it pleasantly surprising, especially since I'm one of the few that sees possible satire in it.
As for THEOL, I agree with Manson15Marilyn almost entirely. Definitely sad. It is called the High End of Low, after all. Good lyrics (big, big pills notwithstanding). And then there's the diversity, which I appreciate most of all. Some see that diversity as making the album feel less cohesive or as even a steaming mess, but it works for me. It sounds like a man at the bottom thinking about the roads not taken.
So EMDM and THEOL are underrated and GAOG is a tiny bit overrated, in my ever-so-humble opinion.