as someone who marathoned the whole series for the first time recently, I'm interested in that part.
The only time where I thought Gray's power is "cool" was in the Movie and whenever someone casts that ice-prison thing which destroys your own body if you decide to use it, solely because the casting sequence and stance looks stylish
aside from what the guild thinks about him, his power was always one of the weakest and most boring in my book.
gray's fights: ice lance, ice shield, (poorly animated) random ice spikes emerge from the ground and him getting beaten to a pulp 99% of the time