I read it and I didn't like it.
The characterization was pretty good for Scott but seeing them all go into the Terrigen cloud seemed too much like a bunch of lemmings going off a cliff. It's only mitigated due to none of them knowing the Terrigen was bad now (Which means all of this is Reed Richards fault). Also this effectively made Scott into Captain America from AvX. For some reason not sending intel to those who are the supposed perpetrators of a coming crisis and forcing his agenda on them.
Scott in the beginning was pretty on point. But the ending seemed like it was brought on with the force of all the anvils. And I'm not sure about Illyana's disagreements. I mean I get that she would voice them and I find them in-character to raise her opinion but...I don't know. Maybe it was her posture or something. It felt off.
Someone mentioned that the Madrox that died didn't have the M tattoo. So either this is artist error and they're right on this being another dupe. However doesn't Jamie reabsorb his dupes or something when they die? If so he's still in danger.
The Inhumans...I can't fault the new kids. They have no idea of what's going on in the shadows. This however gives shades to Crystal since she seems/is supposed to be portrayed as the likeable royal family member.
Also its bad when the xmen kill people out to hurt their people but when the Inhumans do it, its fine.
Finally spoilers:end of spoilers
I think MarvelMAster mentioned Emma doing some nudging on Cyclops. With this issue, I think MArvel's given themselves an out to say that Scott was already dead and that the person walking around is an illusion. I know its iffy given Illyana's powers but its something consider since that cover of issue 4.