It's only four hours long, and you'd have to play through the game about 5 times to unlock everything. Every playthrough is exactly the same unless you play on hard mode.
After watching the same 4-hour sequence 5 times consecutively, you'll collect all achievements and never play it again.
I'm still playing. But I just picked the game up a couple weeks ago and my first character just hit 58 on hell. Had to change my whole build just to get past act 3 hell. :/
But Zoltun Kulle did drop a legendary, so it's not all bad.
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