Of course death in superhero comics doesn't usually last, but it seems to be a particular joke in the X-Universe (Wasn't Siryn actually making fun of Banshee being dead because she thought that everyone else returns, so why not him?). I'm not sure if Reverend Stryker was supposed to be a mainstray in the regular 616 X-Universe, but there's really no point in bringing him back a million times. Also, get Lady Deathstrike some consistent characterization. She seems to go from being a villain, to a semi-villain, to an ally, to a FLAT-OUT EVIL villain, and then back again. I would also remove Apocalypse being retconned to so many characters as well.
And Cyber (The Wolverine villain.) is a really cool villain, but he seems to have been killed and resurrected so many times at this point that it's just a joke. I vote to just keep him gone for good at this point.