I am not a tank. If you need a healer or ranged DPS, I have more MMO experience than I sometimes care to admit. My view is that having something beating on your head is a bad tactic, to be avoided. In group situations, however, I love my tanks, and they love their shields. Blocking with a shield is much better than blocking with your face.
I do not often post just to toss out a link, but that is a great post about a rather different approach to the game than mine. If you are anything like me and want to see how the other half lives, check out the shield on that lass.
Hat tip: Syp