*CRASHES INTO THE THREAD* Fellow Bull rider here! I am late to this party 
Lets see... I had no opinion on Bull at first, I was never a huge fan of Qunari to begin with, didn't care for the fact he was romancable and didn't think I'd ever bring him along on my travels aside from a quick test run.
Boy, how I changed my mind XD Or rather, how he changed it by being his big adorable self.
I was gonna romance Dorian first, and then Cullen, and perhaps do Bull for a third play through... and then I actually got to recruit him for the first time. Needless to say, he surprised me a lot and I ended up romancing him with my very first (and so far only) Inquisitor. And I'm quite liking the whole dom thing actually. I haven't had a need to regret it
How can I not love this big dork.
A question for everyone:
What's one thing that you liked the most about the Iron Bull? Whether it's his personal quest, his romance, his personality, his relationship with the Chargers, his sexy self, whatever it is, what do you like most about him? Specificity is key!
It's gotta be his personality. I honestly expected Bull to be this stereotype muscle head... but underneath all that mass and the intimidating appearance, and when he's not bashing in heads, he's just a really sweet gentle guy who cares so much about his Chargers, it's really endearing and I love it. Ugh, and when he goes into fanboy mode when you fight a dragon!
And the fact that while yes, he's top and there's no way that's gonna change (don't want him to anyway), he made it so very clear that the Inquisitor's comfort comes first, like that's the most important thing to him. Not his own needs, no, but the Inquisitor's needs. I really like that.
I love his sense of humor too, he's hilarious with Varric.
And of course nothing tops the... 'blinding Cullen' scene XDDD
I just wish I'd get actual party banter about the romance. After the fourth romance scene (where you can tease him about marriage and listen to him sputter) I haven't heard anything, not even one single comment from the others aside from one line from Krem. I was so looking forward to that but... ugh, this stupid bug.