To read posts on the theology of Jüngel, see the link above. For an example of my most recent post at this discussion, see below:
"European Christianity hsa considered itself capable of thinking of God in his being as God without thinking of him simultaneously as the Crucified... the perfection of God required by the law of metaphysics forbade imagining God as suffering or even thinking of him together with one who was dead. This prohibition and its alleged reason are seen, however, from the perspective of the word of the cross, to be the basic aporia into which European theology has blundered" (GMW, 39).
This may be one of Jüngel's most crucial insights (pun intended!), but he gets it from the Lutheran tradition, so he can't claim it as coming to him ex nihilo. He also rightly qualifies the social and continental location of theology he is criticizing, not necessarily because the criticism can't be levied against theologies in other places, but because he is mostly in dialogue with the European theological tradition.
He goes on to state that "faith in the crucified One as true God and the theological consequences of this faith do not merge easily and without difficulty." You can say that again. This is a constant challenge, danger, aporia. Nevertheless, naming the aporia goes a long way towards addressing the issue. At least the lack is now known. It has been diagnosed.
Thinking God together with the crucified is what leads Jüngel to understand God as not simply "necessary" (the traditional metaphysical understanding of God in relation to the world), but rather as "more than necessary". This is a metaphysical way of saying what can be said more precisely and yet less clearly as "God is not God without humanity." Or at least God does not desire to come to Godself without humanity. If this saying confuses you, then see, you've already started not thinking of God together with the crucified, because isn't the crucified human?