Yeah, we can both agree that Slow is better than some snare effects that frost has, if we do a 1-1 comparison. But,
frost has not to choose a cc spell, it gets the whole package. So we have to compare cc arsenal vs cc arsenal rather than Slow vs Blizzard, for example. (I was
not implying that, because
frost has 6 ccs and arcane has 1, frost ccing's power is 600% better.)
Moreover, even
if some frost's cc looks worse than SLow, 1-1, you do not have to forget that they all together compensate each other, the so called sinergy. Are your enemies temporarily immune to snare effects? You can use Freeze and DP,
as arcane you are fucked. There are 2 melees chasing you? You can use FO/Freeze,
as arcane you are fucked. Did your frost nova get dispelled? You can use Freeze,
as arcane you are fucked. Is a healer casting a heal and your CS is on cd? You can use DP,
as arcane, you are fucked, and so on.
Is Slow as good as Blizzard? Nope, Slow is actually much better, Blizzard is almost never used for its cc, pvp wise. Is Slow as good as Blizzard
plus FB FBB FO DP Freeze? Not even remotely close.
In addition, Slow looks overrated on paper. You lose 1,5sec to use it, does no damage, and lasts 8sec. To achieve a 100% uptime on a target you lose 18,75% of your time doing nothing but applying it.
Slow in WoD will be castable on multi targets. Does it look op? To achieve a 100% uptime on 3 targets you have to spend 56,25% of your time doing nothing but applying it.
Snare effects haven't ever killed anyone.
Who will kill your enemies if you spend so much time to do something that other specs can do passively while doing tons of damage too?
And, it is just a snare effect, so
it has limited uses as all snare effects, slowing an elemental shaman that is spamming Lava Burst is not going to help you. Slowing an hunter is not going to help you. Slowing a warrior that does never move but just jumps/charges, on the top of the 50% snare effect
passively applied (so, it kinda counters your slow) is not going to help you, and so on. There are lots of cases where
pressing your Slow spell will have purely negative impact (you just waste 1 gcd).