do i have to watch the previous 3 movies?

Or is it possible to skip 1 and 2 as i hear 3 is good and 4 is better.
also i cant for the life of me find 4 with ENG subtitles ANYWHERE, would be a great help if someone could point me in the right direction.
Cheers.

It is no measure of health, to be well adjusted, to a profoundly sick society.