I think this card was meant to either be unique or have a limit of 1 max per player.

If we're able to start the game with +3 def it would be broken.

Did FFG forgot to put either the unicity or the limit ?

Erratum from RRG 1.8:
IRON MAN (#29A)
Should read: “You get +1 hand size for each Tech upgrade you control (to a maximum of +6 hand size).”
(Changed “(to a maximum hand size of 7)” to “(to a maximum of +6 handsize)”.)

This lets Iron Man benefit from cards like Assess the Situation, even if he has maxed out his hand size from Tech cards in play.

This card combined with Show of Empathy should work so incredibly well. Add in Master Manipulator and you have an unkillable Ally that removes 3 threat or does 2 damage every single turn. Since Kingpin is not elite you can take it with Show of Empathy and while Master Manipulator is out the Kingpin ally can't take any damage and there is no icon on Master Manipulator that makes you want to defeat it.

There is a typo: Daredevil THW should be 2 not 1. also the "forced interrupt" text is missing on the hero side, it should have: Forced Interrupt: When a Sense upgrade would leave play, place it on the bottom of the Sense deck instead.

Blindspot is crazy. A Psylocke who can help control the board rather than need to attack the villain to get max value. Best I can tell, there is no Justice or Basic upgrade that can attach to the villain, but in a multiplayer or multi-aspect situation, Energy Shield and Coordinated Effort can. Daredevil, Iceman, Nightcrawler, Rogue, and Cyclops come with their own consistent upgrades to attach, so these will be the best heroes for Blindspot. While the X-Men may prefer to stick to a Utopia strategy, I think this is an auto-include for DD in Justice.