Statements like this are what cause people to shy away from Blood. Yes, as Blood you will take certain hits without bloodshield up, that's just the nature of our am - however, if you understand the class and play intelligently, you will have a shield for every dangerous attack that comes your way. Also, we have cds out the ass, so if you ever find yourself in an oh shit moment, there's always something to pop.
OP - If you're interested in it, then give it a shot. People are too quick to give sweeping generalizations about specs/classes, but it really comes down to what you like and your skill.