With 5.4 we have had several changes that significantly reduced the value of additional haste past ~5-7k in heroic gear. Mastery is somewhat limited in value for 2h due to its attack priorities. That places critical strike as the most valuable secondary, which despite being devalued by KM, I can accept. What seems strange to me is the jump in crits value above strength (gem wise). Until late 5.3 I had never run across any simulation which placed critical strike above strength for 2h frost (again, gem wise). Now with the new simulations in 5.4 crit is suddenly well above strength in most situations, which would seem to indicate a reduced scaling effect of strength. Granted obliterate and frost strike are weapon damage based and not AP based, making strength's contribution limited to the AP component of weapon damage scaling, but I do have a hard time believing an item level jump from ~543 to ~574 would see such a large increase in crit scaling and/or a decrease in strength scaling. I have yet to see any skilled DK gemming strength and I haven't had an opportunity to compare strenght gemming to crit gemming in a raid in weeks (offtanking at the moment), but I find myself questioning the accuracy of our simulations.