Personally, the only game I'm looking to pre-order right now is Arkham Knight, mainly because it's a Batman game that's back safely in the loving arms of Rocksteady - Arkham Origins was alright, but it just couldn't stand up to Arkham City in my book, and the glaring lack of Rocksteady's logo on the box seemed to indicate why.
I totally understand why people should stop pre-ordering, though; once it may have been to ensure you'd get a physical copy of a game you were worried would sell out. But of course, the leeches in the industry had to turn it into a method for squeezing money out of the customers. So something that might have once been considered a little bonus is now a super premium service, using borderline propaganda to browbeat people into preordering, for a little bonus that's usually fucking worthless - the Goliath skin you get for pre-ordering Evolve, for example, basically turns the Goliath into a barely noticeable shade of red.
It really falls to the game, though; the biggest reason not to pre-order that I can garner is basically, "you buy it before it's out, and therefore before word of mouth gets around, attesting to the game's quality." The thing is, Arkham Knight, in my eyes, is looking VERY good, and it looks like it's evolving from the absolutely SUBLIME Arkham City while not deviating from the things that made it great. So I think pre-ordering it is my way of committing to getting it, while also getting the Harley Quinn and Red Hood stuff as a bonus. So, yeah, call me a sheep with a loose wallet if you must, but I'm pre-ordering it on Steam so I can just have it ready to play when it comes out.
Early Access, on the other hand, seems different to me than pre-orders; at least you can actually PLAY an early access game immediately after you buy it. Yeah, it spits out a lot of stuff that are 'games' in the same way a bunch of sticks and wheels glued together are considered a 'car', but Viscera Cleanup Detail and, more recently, Darkest Dungeon are the two reigning kings of Early Access. They came out with a fully functional, polished product, and put it on Early Access so they could use the funds to add more to that base product.
I think that's something people should work to do in Early Access; if you can't afford to make the entirety of the game you visualized, put everything you can towards a solid base product, throw it on Early Access and attract enough interest to let it grow.