"How much health and armor do I need to tank Karazhan?" "Am I ready for SSC?" We've all seen the questions, but we still haven't created a clear set of guidelines. We need help to set up a reliable function on our calculator page.
Do you remember how much Health and Armor you had (buffed) when you were first able to reliably clear a raid zone? Do you remember how much Avoidance you had? Do you remember the relative difficulty of the encounter with those stats?
while i think this is a great idea i believe it will be flawed as many of us may have been significantly overgeared for a fight over undergeared but our raids gear could compensate for this lack of gear or in some cases our gear compensating for others crappiness
Will it be perfect? No. Will it show a clear and reliable pattern for 90% of progressing tanks? Yes. The chart I've put together shows a fairly steady progression, and user input is doing a great job of defining it.