I'll have to disagree on this one to the original review. I think that Jessica Jones is one of the weaker allies in the core set. The majority of the time, I am getting a blank 1 Thwart 2 Attack ally that will end up punching a couple of people and has no real benefit other than that. Perhaps it is the way that we play, but we don't end up letting schemes sit around. So, at best case she is a 2/2 for 3 cost when you see her. She is a very vanilla ally that won't bring much to the table.
I think that in the Justice aspect, what she is bringing to the table is really just a little hitting power since Justice is a bit lacking in that department. No complaints about getting 4-6 damage out of her when its needed, but I don't expect that much more from her.
It has recently gained significant power in the latest pack with The Wrecking Crew however. She does some serious work in that match-up.