Mannahnin
Scion of Murgen (He/Him)
I was in part just offering it as a counterpoint that any weapon vs. ac system would necessarily look like the Greyhawk and 1E ones, but yeah, I think Delta's first crack at it doesn't quite work.Chain was Excellent against slashing attacks, not just "Good". It was certainly better than Leather.
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In short, heavier armor was generally simply "better", but according to the table above Leather is the best overall with two Goods and an Excellent. That alone tells me this is not a realistic system at all. There might be more to it I am missing, but those are my first thoughts anyway.
Did you check out Matthew's points in the comments? I like his ideas, though I'd be inclined to bump his suggested +1s to +2s, because I agree with Delta that +1 bonuses are a little too small and fiddly to really bother with.