It only makes them look tanky, cause their health doesn't move, but shields are brittle and can fail. You are also much more vulnerable to CC as a shield user. If you can't shield, because you are breaking free, or especially because someone has run down your small stamina pool, and you can't break free, then you're toast.Shield spamming on magic builds has gotten pretty lame-o...it makes them ridiculously tanky.
Oblivion Torug's isn't as powerful as Shieldbreaker against a shield based build, but obviously still dangerous; and this is exactly what a recap will look like. Learn how death recaps work before commenting on them.