Depends on the developer, I would never ever pre-order a game from Ubisoft.
this is 100% truth. I find that early access is what you use if your a known developer like Bohemia Interactive and Techland. I say techland because they will soon be sending hellraid up on early access and its been in development since 4 months after the first Dead island came out.
One company who i feel should of been using Early Access is Egosoft, the developers of the X series space games. We all know how bugged out and terrible rebirth was at release, but they have been continuing to fix it and update it and it will be a year this november since it was released.
If egosoft had instead followed the Lead of Bohemia Interactive, i feel that the current 2.51 version of the game would of instead been 1.0 release candiate