Imo the seek range/bolt range should be 80 yards or something (does it increase with slvl?).
1.) you have to go melee to use it < tempest
2.) you can attack at 7 FPA max < tempest (total damage multiplier)
3.) can't rmb auto-attack < tempest
4.) -res doesn't work at full strength < tempest (total damage multiplier)
5.) dual damage types > tempest
== very easy to see why this skill fails, unless it multihits like crazy.
As for procs, I think it's more comparable to a melee caster "spell" (that works off physical damage rather than energy/spell damage) than a wdm attack.