anyone explain to me why topmage(arena) haste

[:1]frost mage used to stack crit chance because of the triple crit chance to frozen target. so b4 33.3% crit chance( as i think) crit is the best state... and then mastery to increase the damage to frozen target. As a result , frost mage can do a huge burst damage. But now , as i checked the 2v2 arena , all top mage socket haste gems and reforge crit to haste. i dont know why this happened after one patch ..Is it because of the increase damage of frost bolt ..coz ice lance used to be used a lot .. Looking for help from gd pvp mages thx a lot
Interesting, i would like to know more too
i asked one of my friends, he said because of time warp if not allowed to use in arena ..so ppl need more basic haste to sheep and do burst damage ... but i still dont get it ,coz without crit when deepfreeze ,frost mage gives no burst damage at all :D waiting for answer

Copied from EJ:

Surprised how Crit has dropped in relative value? The biggest factor is Ignite Munching. In a bug-free world without Ignite Munching, Crit would be considered a much stronger stat. But in practise, Crit loses considerable value when Ignite Munching is factored in and accounted for. Various tools (SimulationCraft, Rawr) now account for Ignite Munching, and as a result, Crit has been devalued to levels that more accurately reflect ingame results.
yup wt u posted is for fire mage in pve ... wt i wanna to know is why frost mage atm will choose to stack haste in arena 2V2 teams :D thx

Copied from EJ:

Surprised how Crit has dropped in relative value? The biggest factor is Ignite Munching. In a bug-free world without Ignite Munching, Crit would be considered a much stronger stat. But in practise, Crit loses considerable value when Ignite Munching is factored in and accounted for. Various tools (SimulationCraft, Rawr) now account for Ignite Munching, and as a result, Crit has been devalued to levels that more accurately reflect ingame results.

This is PvE.

PvP: Mages are a control class, not a DPS-burst class in Arena. Your primary concern is not damage, but control. So, logically, your damage does not matter as much as your ability to get off Sheeps/Snares.

EDIT: That being said, Mages currently cannot do either in high-end Arena sooooo. Doesn't really matter anyway?
The answer is, not only because of frostbolt being buffed slightly, but also because the reduced chances for fof to come up, all the mages were gearing crit because we had plenty of ways to generate fof and opening up your main tree was too dangerous and with time warp, u were able to (but rarely) Now since the damage nerfs to frozen targets + lack of fof charges mages are gearing haste, so they can get something out if anything + more reliable sheeps on the healer. That's the best answer i could give you. All gearing haste does for you now, is simply up your out of frozen damage. but it is still s5 low. Hope you enjoy ;)
thx dude~ i got wt u mean.... mage do more cc in arena games and do not need to do a lot of damage .. but if its mage and rogue combo , u really need to burst a target within the time of cc the healer ,so theres a high chance to lose. in terms of mage and disc priest .. the most damage are done by mage . when u meet with 2dps u just need to keep alive and do damages step by step and cc the other dps . However, when u meet a team is the same 1dps and 1healer. u need the burst damage also in order to kill dps or healer , or w8 until their healer oom(another choice). That maybe complex , as a result , is that mean *stack haste or crit is up to ur combo and is not necessarily which is better*