Critical surge is not worth its magicka cost, global cooldown animation, etc... This is primarily due to abilities like entropy and momentum which do the same thing and are better. Entropy is better because its cheaper, and the added effects are nice, and momentum is better because the heal is reliable and the morphs are now fantastic (great job on making forward momentum competitive with rally!). The heals from critical surge are unreliable and that's its biggest issue.
Suggested Fix: Make critical surge also be an instant heal that heals you for your crit % in health. So if you have 50% crit (the higher of spell or weapon), crit surge is also a 50% heal. (The actual heal number should be balance tested, it does not have to be an exact 1:1 ratio with your crit) This would make the ability competitive with momentum and entropy, and also synergize with both stamina and magicka builds giving sorcerrors more build options. Id also suggest making one morph of crit surge cost stamina.
Edited by sabresandiego_ESO on 11 February 2015 17:03 Ali Dreadsabre -Necromancer
Ali Sabre -Nightblade