I've played it to Mythic dungeon level (i've played all tanks to mythic dungeons on beta except brew), and yes the main damage rotation is very easy, is that how we're defining it? If so then you're right. If however we're talking about properly performing your role in the dungeon and utilizing your spec tools then VDH has one of the most interesting and situationally complex toolkits that exist for a tank, there are so many choices to make that can decide how a pull goes. Bears have almost nothing like that, they just sit there and take damage.