This episode is fairly good. I wish AtS had focused more on the entertainment industry. Vampires and the darker side of Hollywood go hand in hand.
It makes sense to me that an intoxicated Angel would turn evil. Intoxication brings out the lizard brain. Angel has a demon riding his lizard brain. When the parts of his brain that serve the same purpose as the soul are dormant, then it makes sense that Angel would act as though he had no soul.
I always thought it was this.The third option is that, even with a soul, Angel still has the Angelus urges to cause harm and suffering to others and he has to consciously choose to ignore them (with the soul making him feel guilty for having those thoughts). The drug lowers his inhibitions, thus his guilt over those urges which makes him more likely to engage in them. This means that Angelus never ever truly went away which casts Angel in a much darker light