for example
11-17 Axe (requires Axe Mastery 5)
Tall Shield Armour +11 (requires strength 5)
My question is... What is you do not meet the requirements? Do I toss a 5-12 Axe and use the 11-17, even though I only have Axe Master 3?
Do I toss a Buckler (Armour +4) in favor of the shield?
Is there any way to tell without testing the items out? Same for energy artifacts.
On another note: I was wondering if the different sizes of shields come into play in GW or do they just enhance your overall armour? Obviously a Tall Shield offers more protection than a buckler.

Thanks,
Rad