It's a little harder, yes. I've had a few times where a mob runs off towards a DPS or healer. But overall I haven't had any difficulties. It's just getting used to the new mechanics.

Before, Blood Price was a "get out of jail free" card that let you tank huge groups of mobs easily. Now you have to put a little thought into your MP management, which I actually enjoy more than before.

You shouldn't be using Unleash that much. Maybe once at the beginning of a pull to secure initial threat and then use DA + Abyssal Drain or the enmity combo, depending on pull. If you mix in Syphon Strikes, you shouldn't ever have major MP problems.