Because they didn't like the game (fair enough) and blame it on the character?
Because he had a voice? (Seriously).
Because he was a human, and couldn't be any other race?
Because people felt he had too much established character, and wasn't just a blank canvas for them to paint how they wanted?
Because there were things in the game that he couldn't change?
Because he was just a guy who was trying to cope with all the crappy situations that kept getting thrown at him, instead of a world-altering God who could outright decide everything that happened in His world?
Because the choices in his game were more about deciding how he reacted to events, his attitude, and his relationship with his friends, rather than choosing the specific outcomes of major world events?
Because they already decided they wanted to be Their Warden?
Basically pick from the above, mix & match style. Replace "He" with "She" if necessary.
My main gripe with Hawke is that the character just seems helpless.
take the witcher games as a good example of how you can have a PC who is badarse and yet things are beyond him.
you can't stop the northern kingdoms falling apart or the invasion of the nilfgaardian invasion.
You can't save foltest or make everything ok, **** happens that beyond your control. Pretty much for all the characters deeds and decisions end up having almost zero effect on the world.
But its written well so that doesn't matter. A big part of it being written well even with a character as well defied as the witcher. is that the character is strong he's the badarse he's who people look to. but hawk? he's just not.
play hawke as pro mage and you have a hard time accepting hawke is a logical character.
play hawke as pro templar or better yet anti mage and these issues vanish yes, but we get a whole new set of problems, the game cannot decide if hawkes the go to guy that everyone relies on and looks to for wisdom or an outsider who's help people begrudgingly accept.
he never feels like a strong character, he's more like a lacky. hawke go do this, hawke answer my questions, etc, etc.
Yes all games are essential this, but with hawke you never feel like he's a strong character.
Gaming is about escapism, if you aren't going to have choices that affect the outcome you need a character is strong enough that it doesn't matter.
from hawke that's lacking, not to mention half your companions clash with your personality either way you role with no way to get rid of them.