That's what I'm getting at really, it works well in a situation based on more than one thing hitting you. I wasn't saying it wasn't the best place to put them more of a side note really, I know it's a common thing with warriors with AoE threat issues. The reason I mentioned the other two talents is because it adds to more mitigation and threat overall in AoE threat generation. We gain threat (small as it may be) via the talents and a higher block value and percentage drastically increases that. That's all I was getting at
nothing bad meant by it or anything, just a footnote
Your math and calculations are perfect, what I'm more getting at is that, overall, Cruelty will directly effect the up time of your Deep Wounds, it's strictly based off of Critical Strike hits, which will in turn effect your threat per second. Look at talents like Incite, they increase the critical strike chance of your Heroic Strike by 15%.
So, you have your base value of say 10% (pretty average for most prot warriors outside of a raid), now apply the bonus of Incite fully talented (15%), you're up to 25%. This means that, in theory, every 1/4 hits will be critical and thus proc deep wounds. Now you may look at the small value of 2% increased critical strike as a small increase, but also think about this, it means you're ability is up 2% more of the time which can equal out to a very long time on a boss encounter and can add up to a whole pile of threat, not just damage. This same 2% is also applied to all base line abilities which can factor out to a great deal more threat and more damage respectively.
Lastly, look at the talent you're giving up, while it's very very useful, it's situational because not everything can be spell reflected and not all mobs random cast. So in terms of overall benefit to the player I'd say you'd best be suited by the 2 in Cruelty as opposed to Spell Reflect, it means more threat and more damage overall. Nothing at all you said was wrong in any way shape or form, you're 100% correct but the thing is in terms of overall benefit in this case the Cruelty would be a more efficient use of talent points. Without a doubt one of the best number crunches I've seen in a while though, MAJOR kudos to you Xenryusho. It's nice to see somebody really really really think things out. Quite refreshing, thank you