Who profits more of Magic Focus?

[Promark]

perhaps you need to read the tooltip better: it increases spell crit by 3% for the target but procs off of any crit, so with the lack of a caster DPS or a non-resto druid healer, putting it on a rogue or fury warrior gives you a continued 3% crit for the entire fight.

also, your second argument is kind of meh. the buff placed on the original caster when their FM target crits lasts 10 seconds non stacking. so if a fireball mage crits once every 2-3 casts (5-9 second window given they're not stupid and have haste stacked) gives the same benefit as an arc mage critting every .5 seconds. as long as they crit ONCE every 10 seconds, you have 100% up time.

perhaps you were the one trolling?

It's possible that I could be wrong, but if I am it is a recent change. http://www.wowhead.com/?spell=54646#comments TL;DR - Melee crits don't count.

Edit - And before you say that it works with Rogues... 1)it works off a rogue using poisons 2) the original comment was placing it on a DK, War and Ret Pally

I agree, the other point is sorta meh, but it is something to consider. The selection of classes are limited in 5 mans.

[detwaltz]

Holy Pally > Mage > Ele Shammy > Boomkin > Warlock

IMO

[Legsarelost]

When there isn't another mage in the raid, I usually put it on the Spriest or a healer, that's just me though.

[warlock_alt]

Elemental shaman already have a way to guarantee 100% elemental oath uptime. It's a spell called lava burst, on an 8 second cooldown.

Both destruction and affliction warlocks actually crit a lot. They may have lower crit rates than some other specs, but they also have a lot of fast casting spells. A class casting 3 second spells at a 40% crit rate is matched in uptime by a different caster casting 1.5 second spells with only a 22.5% crit rate.

[Swizzle]

fact is, that 3% actually makes a BIG difference in DPS for a FFB or TtW/fireball mage, which is why giving them FM is priority. also, you need one crit every 10 seconds to keep 100% up time. let's take a cast time of 2.7 seconds for those 2 mages (10% haste is easy to get). that comes out to 3.7 casts in the period, but lets just say 3, since the .7 is a non completed cast. 1 of those 3 has to be a crit to keep up uptime on FM. the mage would have to have 33.3% crit to keep up approx. 100% up time on FM. since every mage is running around with ~50% crit raid buffed, FM uptime isn't an issue and the 3% they're gaining is a large DPS increase, so it's an overall boost.

[Naphomci]

fact is, that 3% actually makes a BIG difference in DPS for a FFB or TtW/fireball mage, which is why giving them FM is priority. also, you need one crit every 10 seconds to keep 100% up time. let's take a cast time of 2.7 seconds for those 2 mages (10% haste is easy to get). that comes out to 3.7 casts in the period, but lets just say 3, since the .7 is a non completed cast. 1 of those 3 has to be a crit to keep up uptime on FM. the mage would have to have 33.3% crit to keep up approx. 100% up time on FM. since every mage is running around with ~50% crit raid buffed, FM uptime isn't an issue and the 3% they're gaining is a large DPS increase, so it's an overall boost.

I'm sorry but this is wrong. Say 50% flat crit. The odds of 3 non-crit's is :12.5% (1/2)^3 or 1 in 8 so one would expect FM to drop once every 80 seconds, though to calculate how long is more tedious. Also this is an approximation.

The main raiding mage we have puts focus magic on me (SPriest) if no other mages with it are in the raid, because with the DoT's plus mind flay, the chance for me to drop FM from him is very low.
My raid crit is ~30-35%, we'll say 30%. So 3 Dot's, each ticking every seconds, in that 10 second window is 10 chances, so 1-.7^10=.971 or a 97% chance that one of my DoT's will crit, and that is excluding mind blast, mind flay and so on. That's why I get it, as my uptime for him is high.

[Swizzle]

i had a generalization as to why constant crits don't matter since the buff doesn't stack.

point being, 100% up time is nearly impossible due to RNG and movement. anyway, who cares, the person who benefits more from the 35 crit is the mage, therefore, he gets it, which in turn is a net benefit for the mage.

[Kadas]

point being, 100% up time is nearly impossible due to RNG and movement.

Not if you have a caster using instant spells every 2-3 seconds and already has an intrinsically high crit chance. I'm not sure who that would be for dps classes but we (holy pallies) cast holy shock every five seconds with instant FoLs between them on the move, so I wouldn't say that 100% uptime is unreasonable, considering our 50%+ crit.

It still comes down to the type of fight though. I wouldn't ask for more crit on a dps race when a mage is going to contribute far more towards beating the enrage timer with more hotstreak procs, etc.

[Swizzle]

do people not know the meaning of the words nearly and virtually?

[Celebronde]

If there is another mage with FM, buff them with it and get them too buff you in return.. that will increase your dps the most. But if you mean the person who is the soul reciever of FM id say an FFB mage as they get most of their damage from crits.

[growlman]

One of our Healadins offers me boobies, and I gladly accept all the time.

[Kilari]

As a balance druid i can also confirm that Focus magic is extremly helpfull with our Eclipse rotations.

[axxey]

Most the classes you consider will all have 90+% uptime for your mage, you have to consider only what they get out of it.

FFB mages have hugely stacked crit co-efficients, no one gains as much as them if there's any in raid.
After that there's boomkins and ele shamans that both have valuable returns from their crit other than just + damage. Warlocks may compare here, haven't looked at new3.1 specs much.
Shadow priests in AoE fights, mind sear multidot is +++
Holy priests in big Ulduar AoE heal fights, more crit increases their healing throughput a lot.