I strongly disagree, to the point where I'm going to go ahaid and say that anyone telling you to put points into health is just straight up naive. Hardened Ward is actually much better outside of Cyrodiil than it was in 1.6. You can easily get 20k shields with hardened ward alone for PvE (mine is 25k). To put this into perspective, it's a 20k relatively low cost, spammable extension of your health bar that uses the same attribute that buffs your DPS. It is stupidly good.
This lesson on how to sorc has been brought to you by Uncle Xeven.
EDIT:
If you are uncomfortable with ward timing or low health, use purple food.