timeline wise. Days of Future Past begins in the future years after X3. You can basically skip watching the first X-Men movie because it is really forgetable
I wouldn't call it forgettable but it was average as hell...but I would watch it 100 times before I watch the trainwreck X3...that shyt had me :fyou2:the whole time in the theater...I have never been that disgusted in a theater since I tried to finger the p*ssy in high school and the girl gave me the :kimstare: