Well now, interesting reading.
Yes, I have a 46 Warrior, and I use my shield. Curiously, I am betting from what I have read, that not one of you that have warriors have your bash over 100. Mine is maxxed.
Now then, why a shield on a warrior? what is so great about bash? If you are fighting a caster, and you split your windows, as I do, you can see when a caster mob starts to cast, then and ONLY then do you bash it. This interupts its casting. This is particularly useful when up against cleric mobs that can CH themselves. Another particularly useful result of bash is the stun, if you do not have a snarer or rooter in the group, you can use bash to stun the mob as it tries to turn and run, gives you a few more hits before it starts moving, and you can keep bashing it to minimize the mobs runaway.
Warriors have been given some great tools, just need to learn to use them. A good warrior can hack and slash and maintain aggro. A great warrior uses ALL of his tools at his disposal, and does it well. That is the difference between a Tank and a Warrior.
my 2cp.
/rant off