Hi guys.
I've been defending the new runes, because they have brought one very important thing back to the game; The ability for mages to have sustain.
However, I think I know why people are complaining: Electrocute.
Electrocute does up to a 140 base + AP scaling plus AD, and most importantly has a really low cooldown.
I've tried Comet, Predator, Aery, and Dark Harvest as other damage boosts, but nothing adds up to Electrocute's utility, other than perhap a VERY good support using Aery (Karma can make Aery explode in damage, because Aery's returns time very well with Karma's abilities).
I've gotten Electrocute to 300 damage in only 3 built items: Jungle Echo, Lichbane, and a Hextech Gunblade. It almost ensures an execute on a champ like Evelynn, Kayne, Rengar, Jhin, MF, etc.
The rest have some serious drawbacks:
Grasp no longer works on "On Hit" effects but rather literally on basic attacks only.
Aery is very champ specific, and the per hit burst is much lower, making it outhealable.
Predator has an insane cooldown, which extremely limits its ability to execute off its damage, and the charge is interruptible, and often doesn't actually get procced, because fights change to quickly. It's also usually not useable pre 6.
Comet requires slows/cc to hit reliably, and its scaling is much lower than Electrocute.
Press the Attack relies on specifically one type of damage to proc: "hits" aka Basic attacks.
Only Electrocute and Aery can be procced by both auto attacks, skills, and never miss, and Electrocute has much higher scaling.
I'll give you an example: I regularly play Eve.
I've tried Grasp, Predator, Comet, and Electrocute on her.
-Grasp eve is only fun vs compositions where she can get off auto attacks and secondary Domination. it's extremely effective vs a Cho gath, who normally counters an offensive Eve. Also nice vs a Xin, most ADC's, and a fed Zed.
-Predator has its uses, but 70% of the time the charge up on Eve's Charm + boots is clunky and gets countered as the person just runs away before the boots are ready. Timing is horrible. It means a lot of the time, you waste Eve's Predator damage, which means her next ult willl go in naked without the Predator damage.
-Comet misses regularly, and doesn't scaling high enough on a jungle champ's AP (I had 33% hit rate with Comets).
-Electrocute...... I get Triple and Double kills, almost Quad kills. When the other team groups, my Q's on Taste of Blood + Ravenous Hunger just give me enough sustain to stay in, use her Q, and erase 1100 hp off their entire group,+ hit one with an electrocute, which means I have 1 set up for instant KO on ult, and the other two will die from my post ult Q's and E's, if i use R correctly.
In fact, I've played so much league my W and E keys on my keyboard are faling off, and breaking. My W has one of 4 posts actually holding on, and my E sticks and doesn't signal use but like once every 4-5 taps. Yet with Electrocute, I somehow just went 11/4/4 with a super defunct keyboard. I watched as my Q just erased Teemo, Ahri, and Ezreal. Did some 1900 Electrocute damage even though most of the game I was just auto farming jung because my Keyboard was so bad.
On a Karma with Aery, who can proc her damage about every 12 sec in lane RELIABLY, I only managed about a 1800 damage game with hitting about every skill. Sona and Nami both fall behind Aery use vs Karma damagewise (Sona uses the shield 5 times as much as the damage, Nami can use both about equal).
On Comet, I've only averaged 500-900 damage.
On Predator 560-1300 damage, depending on Luck
...... As much as I hate to say it, I think the problem is that Taste of Blood and Ravenous Hunger are on the same rune tree as Electrocute. it allows insane useage, insane self sustain, and you can SAFELY use 3 skills, and heal out of trades.
I miss Ancient Tome and Hextech's spell vamp, so I love these healing runes. But.... Electrocute is just too useable. It'd be better if Electrocute was on Sorcery and Phase Rush was on Domination, because then sustain + damage would be different choices.
As is, No skill Kayns can 1 hit anyone, and from very early, with Electrocute.
and 
are easy items to build second (sometimes first) for many ap champions. 
are not nearly as easy for ADCs to build before 2 items because of how many require Crit and/or attack speed to deal their intended damage. Rushing these items is almost guaranteed to lose you the lane as an ADC.
and all mages aren't 
