I have one minute before class so I will answer quickly! ![=]](https://lvlt.forum.bioware.com/public/style_emoticons/default/sideways.png)
He actually isn't alien at all; he's become too human (qunari in general)
I like big guys, definitely! But he's "too" big... he seems overweight, with steroid-like muscles under the fat. And his head is teeny tiny, and the horns are HUUUUGE. To top it off, his disturbingly human face isn't even handsome, AND he's bald! Let's not forget the pencil thin mustache lol
Remember though, I AM a fan!!! And he has to be my primary romance since I'm sort of out of options (No Dorian for me, sorry; he makes Bull look like Brad Pitt in my eyes, lol!)
Yeah, I can totally understand all these points you made (even though they haven't really concerned me too much, but then again I haven't seen many examples in game yet and try to remain hopeful). I think his huge horns may only add even more illusion to his head looking small, but even without them I do hope it doesn't still look that small in-game after launch. (I hope they've tweaked his looks a bit, and from what we've seen of other characters like Solas, and what they've said on Cass, I think there's a huge chance they probably have) I don't mind the huge muscles at all, but one effect of that is the 'small head' look which admittedly isn't attractive to lots of people. I just hope his head is normal size when compared to other companions, that's all I ask. 
The baldness doesn't bother me but I will say I agree that his face isn't traditionally attractive (although it's of course subjective), and I wouldn't have minded if they kept the signature 'qunari' look from DA2 as long as they kept the variation otherwise and still gave us different faces, skintones, and hair. That was really my only beef with DA2 qunari, they did look really awesome, but they were all practically clones which was kinda disturbing. I chalk it up to the lack of production time that game had, though, not because they wanted that to be the case.
All in all I do like Bull's body, as I've said I'm a fan of muscles, both on men and women - but I can totally understand people's points on his looks. I'm just really too excited for qunari romance (heck even just finally another qunari companion!) and the potential awesomeness of his character to let it override my hype for him, haha.