Great comparison, although honestly some of this is the art. Remender's Rogue isn't so much serious or angry as she is abrasive, she's just in a situation (and with certain people) where it makes sense for her overall attitude to be angry. In JC's cover she looks like she's out for blood.They're all scowling. They all look pissed. You just get the same personality tone across this picture. Compare it to this one:
Which alone portrays more varied personalities. Psylocke is serious, Rachel is tough, but relaxed, Jubilee seems reluctant, and so on.
Uncanny Suffers from all the characters feeling the same.
Same with Thor to a certain extent.
I haven't read much of wanda pre HoM, and don't mind her in this, but I don't really know what's "in character" for her like I do most of the other avengers.