How I feel about ultimates.
I can't speak on most of the ultimate skills since I've only used Energize (mage one that makes skill cool down super fast), but they seem pretty strong. The only problem is that in a good graveyard run, I don't even get to use it once. They take too long to charge. They're an awesome power to have, but it'd be nice if we could put that power to use.
P.S. I've heard energize is also one of the stronger ultimates so some of the others may not be worth it. I think that they need to have the speed at which they charge buffed.