Agreed. I think that EK does a phenomenal job of simplifying difficult scientific concepts so that students can better understand them, hence why I believe their science books are great. However, psych/soc is a different ballgame -- the concepts are not all that difficult (most of it is actually common sense ideas simply with names of people and theories attached to them). I think that EK has made a mistake in taking the same approach to psych/soc that they have with the sciences, viz. simplifying the material. Psych/soc concepts don't need simplification for us to master them, they need to be applied and explained within the context of both experimental and real-life situations -- EK fails at doing this. I got the sense reading EK Psych/Soc that I was simply going through a dictionary of terms. They would literally just define a term, followed by another term, followed by another term, without going over what the term means in the broader picture.
Take-away: I do not recommend EK for psych/soc, but I highly recommend EK for the sciences.