Endless discussion, violetta :) I think all subs like to be controlled, I can't imagine how you'd properly submit unless that was happening. But as you say, you do retain the absolute power because ultimately, he shouldn't be doing anything to you without your permission. It can get razor thin at times, but the moment he does something when you told him properly, truly, safeworded no, it becomes abuse and not BDSM.
BDSM is not abuse, as anyone who knows it will tell you. But there do seem to be a lot of people who don't realise that in the wrong hands, it can easily slide that way. There is a risk if you don't know and trust your partner and even very experienced Doms have told me that they sometimes get so deeply into their topspace that they have to work hard to control their sense of 'menace'. But since they are real dominants, they do. They realise that before they can truly control a sub, they have to be able to control themselves.
Regarding OP...To be honest, what puts me off this guy is that his frame of reference is 50 Shades. I don't wish to be that kinkster who dictates to other people who's doing kink 'right' and 'wrong' and claims to be the one true authority on "real" BDSM...but I have noticed that when that's people's frame of reference for it, their understanding does tend to be on a pretty superficial level. Everyone has their level, and all of them are fine, but in the case of those wanting to dom, it can mean a scene is less satisfying, or possibly less safe. Not saying that's always the case of course, but it's just something I've noticed and would watch out for.
Especially since Christian Grey is a whinging tit.