Just look at the stats that the damage runes get. 20-80% attack speed, with 18% (need to get stacks), and deal 2-8% more damage to champs...
Meanwhile the tank runes are get 2-3 AA worth of defense and a damage proc for 3% of my hp woooo 3 damage per 100 hp at 3k I can deal almost 100 damage (every 4 seconds) wooo...
Oh yea, I'm gonna live forever and do tons of damage with these puppies on.
CoIpsum2 votesI agree they're a bit unbalanced but I think it's fine that tanks have actual tank stats and damage has just damage stats.
Although tbh grasp could use a damage buff, seems a bit weak even on 
, lord of tons of health.
GigglesO1 votesI like that they give tank stats, and damage gives damage stats. However, I feel like there has been a growing gap between tank stats and damage stats since season 1, and these new runes are even furthering that.
I don't want to use the slippery slope fallacy but another few seasons of this balance and we are all going to be playing a game of rocket launchers and hand grenades, and tanks will have to be so inherently op to function that the game is going to be even more lopsided.
CoIpsum2 votesHonestly after a bit of thorough testing I can conclude that you're mostly right, imo PTA is legitimately broken and needs to be changed, that 12% extra damage from all sources makes early game melee champs absolute nightmares. And then Grasp is kind of... meh.
CoIpsum1 votesFor a long time we've had tanks going 12/0/18 or 0/12/18 and taking good amounts of extra damage on top of their defense, and with runes being separate from masteries you could have a full tank mastery page and then have decent damage from runes.
Damage runes should be used when you want to do damage. Tank runes should be used when you want to take damage. There shouldn't be a middle ground of equal for both, that's why juggernauts are stupid in the right hands.
GigglesO2 votesI think you missed the irony of dealing 100 bonus damage every 4 seconds, its not really going to contribute to much of anything, on top of that the extra tank stats that you get from the tree are nowhere close to 40%-100% attack speed, not including the bonus 15% that you get for taking secondary runes with 2%-8% damage amp that probably stacks with 
So free 22-28% bonus damage against champions with 1-2k more hp which completely negates the reason to have more hp.