From what I hear its a pretty good relationship. If they are actually acquired (meaning Activision has the majority of share/control) then yeah. I've heard pretty good things. This one I know because I know a lot of people who work there. It seems both benefit. Some would probably argue Activision more than Blizzard(?) But…
Take it for what it's worth. If the best we're able to muster up is examples that aren't examples that you're looking for I think you can safely assume the number of actual studios bought out that had a great relationship with the buyer is pretty small. Another I can think of was condor, or "blizzard north" they got up to…