I have to admit I'm no fan of Hawke, but I suspect that's influenced by the fact that I was pretty underwhelmed by DA2 as a whole and I found the voice of FemHawke in particular especially bland and lacking in any emotion.
That said, I have no problem with Hawke reappearing in DA:I. His/her story is clearly integral to the war between the Mages and the Templars. Not to mention that the whole structure of DA2 was built around Cassandra's search for the Champion so, given that she's going to feature prominently in DA:I, Hawke is as much a part of her story as anything else.
Plus, treated correctly, our view of characters can change from game to game. I hardly ever used Garrus in Mass Effect, for example. I just found him far less interesting than Wrex or Tali, Liara or, Hell, even arch-xenophobe Ashley. When it was announced he was returning for ME2, I really struggled to understand how on Earth Bioware had decided that might be a good idea. However, once I got into that game, I warmed to him enormously and, by the end of ME3, his friendship with Shepard was one of the game's core emotional strengths.
So, whatever you thought of Hawke in DA2, you may well be surprised at how much your opinion has changed by the end of DA:I. As John Lennon might have said, give Hawke a chance! 