I haven't admittedly played my sorcerer much since Homestead, but shortly after that I started noticing a very bad bug with Crystal Blast(the morph I chose of Crystal Shard).
The animation is severely broken. After you are shown summoning the crystal before it shoots, the crystal then goes out to the character's left and/or to their feet after that before it will fire, doubling the time it takes to fire and hit the enemy at least.
Now, this isn't just visual. The enemy will only show a visual hit and health drop after this full bugged animation has played out.
There is only one event where it actually works as intended. You have to have perfect timing spamming the skill for it to work as fast as intended since the next skill animation starts as it should, after 1 second of animating the first, and forces it to fire at the enemy earlier than it does when not spammed. But this doesn't help if you want to activate anything else or get the timing off and have to wait for the longer animation to play out.

This makes this skill absolutely horrible and half the damage per second that was intended.

Edit:
This is on NA server pc client. I also use gamepad mode but haven't seen that affect skills in any way before.