Hydross would actually be possible for a MB player, I think, but getting the tanks into resist gear and doing the transitions properly would be a huge pain. Still, if you go that right the DPS don't need to move much, and there's not a lot of damage going around. But that's assuming your entire team is in epics to help them survive some hits and do enough damage and healing for a long fight. Most 25 mans you wouldn't even begin to be able to do. Less than 10% of the fights would even be possible at all, and only if you'd raided them extensively solo to see how it works.