Actually, he's more often game than not. It's just that his work in that genre, more often than not, is shallow, by design I think. It's craft. But he's certainly game to do things like figuring out how the powers work, and like that. And anyone who read PLANETARY wouldn't say that Ellis inherently hates the idea of superheroes, or related figures. There's plenty in that about what he loves in it. Same with the Authority--the characters enjoyed their powers(said so all the time, especially Angie), in fact, so much I started to find it irritating.
I think he just doesn't care much for icons you can't play with, one reason he seems more comfortable writing in the Marvel Universe than in DC. (compare his very engaging run on Thunderbolts to the JLA story I mentioned--which also has the crap fallback ending he sometimes uses of "Turns out the villain wasn't such a big deal after all")
For the record? I liked the above-scanned scene, and in fact it's what made me pick up RUINS during a time when I consciously did not buy Marvel. (partly because of the Kirby art thing, partly because they were crap). I liked the first part of RUINS. Then the second part? Utter, anticlimactic garbage. One big annoyance being the change in art style.