Seems like everyone is always raggin on Kaplan here. I actually teach one of the DAT classes, and from what it seems, everyone has a "crappy teacher" who reads out of the book. If this is what they are doing, then they are not doing their job. I always find things outside of the book, the lesson, the course that apply and help my students understand the concepts associated with the material. If you get a good teacher like myself, who actually cares about his students doing well, then you should find the course much more helpful.
Another thing, a lot of people say that the materials aren't that good and are a waste of time; OF COURSE THEY ARE IF YOU DON'T USE THEM!!! Trust me, if you do the online stuff it WILL help you. You may not be able to score 25 with just Kaplan, but you can score in the 20s with enough effort. So many people pay the $1400 for the course and then don't use all of their online stuff- it amazes me because it is really good, but they think just because they paid $1400 they are going to get a good score. On the contrary, YOU (no matter who you are) have to put in the work to get a good score.
Kaplan is one of many roads (and in my opinion, a much easier one) that you can take to get to the score you need. I'm not trying to sell the course, but just expose some of the reasons people post bad things about it on here.