This is how its always been in the comics though. The crossovers required you to buy a dozen different books but it was always worth it in the end.
With the films, the build up is fun and when you reach that event movie, its beyond incredible.
I can't see how you see it as a bad thing. We're going to start getting X-Men event movies now.
Why do I see it as a bad thing?
1.) I don't like crossovers. I'm reading an X-Men comic or watching an X-Men movie because I want to experience X-Men stories. If I wanted to experience a Fantastic 4 story, or a Spiderman story, or a Thor story, I would go get one of those comic books or pop in one of those DVD's. I don't watch Lord Of The Rings and think "you know what this needs? Some Luke Skywalker. Aragorn really needs a lightsaber duel." And I also don't watch an X-Men movie, or pick up an X-Men comic, thinking about how much I need Captain America to show up.
2.) The nature of the type of reboot people are expecting from X-Men: Days Of Future Past is incredibly disrespectful to me as an audience member. For 13 years, I have been following these movies, and following the journeys of these characters and the stories that they are a part of, and now some filmmaker is coming along and telling me that those movies are now invalid, and that THIS is now the proper version of these characters, not the one I invested in for 13 years.
The reboot movement is incredibly selfish. So what that 2 of the 6 movies were less positively received? You don't have to watch them. I enjoyed them, greatly, and now I am being told that I'm wrong for that, those movies are being tossed out, and now THIS is the proper version.
And yet somehow people can't understand how I'm upset?
Of COURSE I'm upset! 6 movies that I love dearly are now being tossed out and invalidated because a bunch of people on the internet can't get over the fact that they didn't like 2 of them.
That's incredibly selfish, and it's incredibly disrespectful to me as an audience member on the part of the storytellers in this process that my 13 year investment in these characters and their stories is now in vain and means nothing, because "oops, THIS is the REAL version. That other version, that one doesn't count"
Screw that.
All this talk about "reboots", "recasts", "event films", "lead ins", "spin offs", "Phase I / Phase II / Phase III" is killing my interest in both the franchise going forward as well as my interest in even this specific movie. Which is a god damned shame because Days Of Future Past is one of my favorite X-Men stories, if not my favorite ever X-Men story, but instead of being adapted because they thought it was a good story worthy of adaptation, they are slapping the title on it to serve an ulterior motive - to say that all those other movies that I've loved for 13 years are no longer valid.
I've been waiting for an X-Men movie to come along and feature Sentinels, I'm finally getting it, this is exactly the movie that I had hoped X-Men 3 would be to end up being my ultimate X-Men movie, and it's being tainted with all this other garbage.
I'm so over reboots, I'm so over crossovers and lead ins, I'm so over the direction this franchise is apparently headed in in the future, and I'm so over being told that I'm wrong for not liking the direction it's headed, and being told I'm wrong for being upset that the previous 6 movies I love are being tossed out like nothing, and being told I'm not a true fan of the source material because of it.
I'm over it all, and unfortunately, it's making me real over even this movie. They are bastardizing this story that I love to serve a ****ing agenda.