Quote Originally Posted by BrothelMeister View Post
Not really sure what numbers you're using, but 100 haste increases your casting speed by 3.05%, which means your damage and healing output is up by 3.05%, and you don;t have to stand still as long to cast your spells. 100 mastery rating increases percent chance to fire another nuke for 75% damage by 4.36%. Even if 100% of your damage came from nukes, which it does not, that is only a 3.27% increase in your damage output, and your time to cast these nukes is not faster.

100 Haste increases damage AND healing by 3.05%
100 Mastery increases (theoretically) just damage by 3.27%

For PvP, trading in that small amount of damage increase for an increase in healing potential is a pretty good idea.
Ahah. My mistake. I was of the assumption that 1 mastery rating was equal to 1 haste rating from a percentage point of view. Definitely if this is the case and the numbers are closer then haste is more useful.

My point about standing still was more along the lines of more often than not being able to get the same number of spells out in a similar amount of time. ie:
+10% haste LvB 1.35s
no haste LvB 1.5s

If I have anywhere between 1.5 and 2.69s to stand and cast then the toon with the mastery over haste is ahead. Sure if I am in that golden zone of 2.7-3s haste comes out ahead, but then from 3-4s again the mastery character is ahead. If you are allowed to stand still and cast in PvP for much longer than this, then you probably don't need to theorycraft to this extent to win.

Similar sort of theory to getting all of your LvB or nuke of your choice to land in sync rather than separately I guess. Even if it takes 10% longer to get there, all of a sudden that character has 10% less health than they did an instant before or you have a kill.