Some of the in-between stuff looked interesting. Mainly these (Ellis, Hickman and Black Panther/Namor beef).
And to be honest, I thought the couple of issues of Bendis New Avengers I read were decent fun...
The main Panther/Namor beef comes from AvX. To understand the X-Men's side of things though you'll need to at least know about the events of House of M, and the Messiah Complex, Messiah War and Second Coming saga (so you know who tf Hope is and why she's such a big deal for the mutant populous). I don't recommend reading the latter three arcs though.... I didn't like em.
Anyways after that I think you're good to stick with Hickman's Avengers and New Avengers run. I didn't reading anything else Avengers wise prior to picking his run up and still understood everything. And fucking loved it.
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Anyways, X-Men Worlds Apart is FANTASTIC.
Cyclops going SCHBIIIIIIIIINNNNNNNNNG with his eye beam at Storm
Storm going CHOOOOOM with her bolt of lightning while standing there unfazed at his attack and then nonchalantly stating 'Is that all?'
Storm not giving a single fuck when conversing with the Panther God.
Storm sucking the air out of everyone's lungs while they were tryna attack her and saying 'You breathe when I allow it'
The huge ass tornado air vortex thing she makes while tryna intercept Cyclops in the first page of issue 4.
I was absolutely SLAYED.
This is why I stan her.