if I am unsure about a game I usually wait until its at budget price. Often the wait isnt that long, ff13-2 went budget within a month of release.
Clearly the law needs changing for preorders I think either preorder needs banning or there needs to be a system in place where it can be returned for full refund within X days of purchase.
When I do get burnt tho I normally just eat it and move on. Usually games I am unsure about I ask for as birthday and christmas presents. Especially if they full priced. The majority of my full price games I didnt purchase myself, my family wonder why I buy £20 games and ask for £40 games for presents