Thematically or mechanically?
Thematically, I don't think there's much difference between reanimation and mind control. In both cases you are taking something that your opponent created; hijacking their magic to bow to your will.
Mechanically I think that reanimation is less of a concern than Mind Control, since your opponent was no longer getting any use out of it, and more importantly since reanimate effects currently are priced to be permanent effects. Meaning you pay once for a creature that you're presumed to then keep until it dies. Mind Control is priced as a temporary effect, where you get it for a really cheap up front cost and then if you keep it past that you have to pay Upkeep on it. That is the current situation though. Hypothetically, there could be super cheap reanimation effects in the future that then have an Upkeep cost. These would then have a similar problem in economics as the Mind Control does, though again you wouldn't be taking a creature that they were using away from them. Unless of course we ever release a Mage that works off of their discard pile, getting more powerful as they get more things in their discard pile, or easily able to get things out of their discard pile. We already see things like this with Slavorg and Gloranna. Reanimate effects, like the ones we have now, that Obliterate the creature upon destruction then ARE taking away from your opponent.
So, basically, I don't have any issues with the ruling.