Hello, jack is pretty great in theory, but it would be awesome if instead of a 100% DPS, he would get a taunt ability, so monsters attack him before anyone else, making him even greater!

Yeah, it would be amazing if he got Thalia's taunt ability. Its not worth to lose whole front row just to benefit from pumpkin.

... Fifth-ded?

As a possible solution, I'd remove the first skill, slide almost all the rest down, and put the taunt second to last. He won't miss the DPS.

Another request: change his last ability to be something different than what everyone else has. He's the game's first dedicated tank - let's make him a tank, make him special. Instead of the boost to DPS, give him a stacking multiplicative (so it 'never' hits 0) damage reduction, even something like 1%. Changing up the final skill is something I've been interested in when it comes to differentiating the heroes.

EDIT - same for his enchantment points. Make them contribute to his damage reduction instead.