The one issue I have with Grid involves the pet units. On the Raz fight, the MC'd mobs move around so much when they are releasing and reacquiring, I find it difficult to sort through the boxes when there are pet classes in the group. Normally, the MC targets don't need too much healing (unless they are controlled by me or someone like me!), so it is not much of an issue.
EoE takes some effort in P3 as well. I am usually tasked with dedicated healing, and when Maly focuses on someone, it can take some time to find them in the pet bar. As long as we are grouped together, I guess it doesn't matter who I target as long as someone is getting the full AoE heal. It usually works out well enough.
Other than that, <3 Grid