Im a ranger and stack ac whenever its possible, buffed I'm close to 800 at lvl 35.I feel it does make a noticable difference, but the max hit thing can be tricky when you are watching the numbers come in. Mobs are intended to hit hard ensuring tanking never becomes trivial unless you have like 20 lvls on the mob. I'm not sure about actual numbers tho and agree a parse is needed to really prove anything, but I've found in stat gear with low or no ac I'm much gimper at tanking for any substantial time.
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