I think what seems to be missed from this card is that it is set to utilize heroes who already have high thwart and attack to give them extra actions. Cable, Spider-Woman, Captain America, and others that really bolster their stats and often don't need chump blockers can utilize an ally for multiple basic actions during a turn. Not to mention characters like Iceman who get benefits from their attacks so lending him extra actions can help control the board better.
When considering this card, don't look at it from the perspective of getting the Ally's stats twice, but look at from the perspective of getting the Ally's stats PLUS whatever you are going to use on the activation from the ready. If Captain America has a 5 thwart, THAT is the additional value if that is what you are doing with him on that extra activation.
Someone like Wasp could use a Moxie changing to Giant-form, a Morale Boost to fortify her stats to 4, and then use this to give her a pair of attack or thwart to utilize her "leave no waste" basic actions. And with a 5 Defense, she isn't worried about the fact that Ally just got discarded.
In the above scenario, it aided in 6 points of production, not just 4, and with Wasp, a turn like that can clear two side schemes, a minion, and still take a threat off the main scheme, while securing her a great defensive position. This isn't even counting other factors for the turn, such as possibly having enough resources to play another Ally with a good entry effect, but you already had three allies and needed to dump one.
Civic Duty, R&D Development and Adrenaline Rush are other cards to consider to combo with this where you are trying to maximize multiple activations in a single turn. Ant-Man, Wonder Man, Maria Hill, Hawkeye, and Kid Omega are all cheap allies that could be considered for sacrificial lambs when they were on their way out the door anyway (those with entry effects you way want to usher out the door). Earth's Mightiest Heroes can supplement addition activations for Avengers (which it looks like we'll be getting more soon).
This is an interesting deck-building tool which the game can use plenty more of. This idea from some of the MTG guys that it's "staple or bust" is silly. If you are trying to build a Leadership deck where your hero is the point of attack and not the allies, this is a card one could consider.