Personally I like most of the companions, and I do not get the Wyll hate. I think his problem is that he is a bit underwritten (I preferred his EA version and would have really liked to see a zero to hero story with him), but he is a delight together with Karlach and one of my go to companions for good runs. I can understand if people find him boring, though.
I made a threat about more content for Wyll, especially in act 3, but I'm afraid, it will get buried among all the romance threads.