Not that ridiculous actually. If your shield is protecting your head and torso and you don't move it a tiny bit, an archer would simply aim at your legs. Having to time-block every arrow makes sense to me and, furthermore, you can also sidestep at the right moment to avoid damage.
It's been awhile since I've been out to the archery range, and I'm not what you'd call an expert, but...
From what I know about projectile weaponry, be it a bow or a gun, you always, always go for the center of mass. Going for the arms, the legs, or the head in real life is a great way to miss. Especially the legs since gravity is going to drive the projectile downward, making it so more likely to hit the ground in front of your target, then you are to hit their legs.
Hey I just thought of something....Deflecting Arrows? Lynda Carter?
Oh I hope the Golden Eagle Armor and Sword of Hephaestus is in this game!
[img]http://img101.imageshack.us/img101/4347/wonderwoman173coverbyad.jpg[/img]