I agree with both sides here. The Buzzfeed list is pretty unfair, especially when you consider all that they HAVE put in the movies. If they took out Apocalypse and put in Mr. Sinister then Buzzfeed would be complaining that there is no Apocalypse. You can't have everything.
That said, I'm not sure why they've never gone with either a lineup of the mid-80s comics (roughly Wolverine, Rogue, Kitty, Peter, Kurt, Storm) or the 90s cartoon (some combination of Wolverine, Rogue, Gambit, Jubilee, Beast, Storm, Jean, Scott).
Personally I'd prefer the former group but in both cases, why not go with the proven chemistry that people already adore? In a way it doesn't even seem like X-Men, which I say as someone who has enjoyed the films on the whole.