I'm biased but because of the burnout I got from playing EA so many times I kind of hate Act 1 now because I know it like the back of my hand. Plus the plot is at its most uninteresting there IMO.
I'd honestly disagree.
Act 1 is the only time in the game where the plot is actually remotely decent.
The whole "Tadpole in brain is bad. Lets find a way to remove it" is simple, but effective. It provides good reason to get involved with things and you're not bogged down the terrible knowledge that the whole tadpole/artifact fiasco is a literary landfill full of poorly written characters and badly realized plot points...