[Snowflakian]

Certain Volumes of X-Force v3.
Dark Angel saga.
Academy X: Childhood's end.
Slingers
Spider-man: Identity Crisis (or whatever it was called.)
and then X-23: Target X Tops my list for now.
Alongside certain stories from the ongoing too that top my list.(Touching Darkness, misadventures in babysitting, issue 7... Though collision is convoluted with too much content and can confuse readers with how overtly subtle many aspects are, but that's why I favor X-23 stories. The subtext and nuances that are just layers ontop of layers ontop of layers with social commentary.)

Dark Reign would be on my worth a read list too, but it bleeds too much from other marvel like civil war, and secret invasion.(Secret invasion, civil war, and so far the current return of osborn is on my worst list. I get bored easily with stuff that's been done already that feels like marvel is trying to redo a storyline they've already done because it was well-received.)

TBH, so much of marvel bleeds together, the best gets buried to me under all the crap.

As for utter crap that there is no redeeming?
Clone Saga, One More Day, OMiT, Wolverine in Hell, and I'm starting to get burned out already on AvX and it hasn't even hit yet.

Onslaught and Heroes reborn I wouldn't call awful, but they don't rank high on my greats list either.