Skills that I personally never use:

Freeze - Do I even need to explain this one?
Lethargy - a lot of high end mobs are immune to this anyway
Manawall - used to be cool. Now it's just a rubbish version of stoneskin.
Surecast - I get interrupted a grand total of never, and when there's even a small risk I'd use Swiftcast over this any day.
Stone II - caveat attached. It's still good for level capped stuff, otherwise Stone III surpasses it in every way.
Repose - Remember when sleep spells used to work? What happened after level 50?
Divine Veil - I'm sure this has a use. I'll be damned if I can figure out what that is though. It's like a rubbish version of galvanize.
Shukuchi - On paper, it's an awesome skill. In practice it's almost impossible to use quickly due to the AoE marker placement required.