Some of the things you do ARE completely pointless... There are times you are just clickign a button to move the story along... But, then there's another level to it, where, in the fights, you can miss a few buttons, but still make it through, or miss just one, and die.
I had an experience earlier where I missed ONE button, and one of the characters died. I retried it, to see if you just die at the end of the fight no matter what, missed four completely different buttons, and made it through alive but the guy got away.
There are VERY distinct moments where the story can diverge. At least one fight for each character can end in them being killed, and there are a number of points at which things branch off depending on something as simple as a wrong turn being taken. Still, it's just an old point and click adventure, nothing new, and it's not nearly as expansive as it is made out to be.
It's an interactive adventure/interactive film/interactive entertainment/twist and click/walk like a duck/mystery-thriller, and it's a blast... stop tryign to put a label on it, stop trying to defend or bash it, and go play it.