Quote Originally Posted by arctic View Post
Blood for Blood - Increases damage dealt by 10% and damage suffered by 25% for 20s.
Hawk's Eye -Increases Dexterity by 15% and guarantees that all attacks land.

With an emphatic yes, not having these skills will hurt your over all performance.
Agreed. Thankfully, I had a DRG already leveled, so I just had to level an Archer to 26 to get Hawk's Eye. Even that was somewhat painful, so I feel for anyone who has to go back and level things pretty high for a cross-class ability.