Wow, you thought the storyline was good? Does it get radically, incredibly better after Act I? Because I've got to tell you, if it doesn't, I have no idea what you're thinking. I played Act I and was less than impressed. Then I watched the Act I end cinematic and quit the game. If D3 had been a book, I would have thrown it across the room at that moment.
Please understand, I don't expect great storytelling or scintillating dialogue from a computer game. The D2 storyline was not inspired, but it was enjoyable. This was just... stupid. It made no sense whatsoever. I am now trying to decide whether I enjoy the gameplay enough to turn off all story features and just play it as a straight action game. (To be fair, it is quite a good action game, but story is very important to me.)
				
			Please understand, I don't expect great storytelling or scintillating dialogue from a computer game. The D2 storyline was not inspired, but it was enjoyable. This was just... stupid. It made no sense whatsoever. I am now trying to decide whether I enjoy the gameplay enough to turn off all story features and just play it as a straight action game. (To be fair, it is quite a good action game, but story is very important to me.)
				
The storyline of Diablo 3 has, so far, been excellent and epic feeling, and I’m only in Act II! It continues on from the previous games, involving the crusty old Horadric Mage, Deckard Cain, guiding the hero to fight against the last of the Lords of Hell. 
I’ll admit I was a bit disappointed early on to be fighting some of the same threats I faced in the previous two versions of the series – the Skeleton King and the Butcher are the first two bosses... surprise! But the enhanced AI and graphics, as well as the new powers of the monsters made the fights quite a bit more epic and fun in the long run. Overall, the AI of the monsters is pretty sharp, although some of the critters have bizarre behaviors that sometimes get the best of them – like stopping to munch on their fallen comrades or stopping to laugh at you.