The main problem with this planewalker is that shes only got 2 loyalty counter. A single shock can kill it. In Modern, even after a +1 ability, it dies to bolt.
Also, in multiplayer, shes not that great. The -1 ability is the best for multiplayer and multiplayer EDH.
In 1 Vs 1, the +1 ability is solid.
I never look at ultimate, cause it happens 1% of the time