I loved ED. As a game, it has astounding attention to detail, and a relatively complex story. The game is best enjoyed alone, at night, when it's dark. It's also a good idea to try to play at least a chapter at a time. The chapters provide you with natural breaks in the story line, so I say take advantage of them if possible, though I always trying to find the next page before I set the game down (so the puzzles from the last chapter are fresh in my mind). Also, the extreme insanity effects (the ones that really get ya) need to be few and far between (the rest provide ambiance). If they had made the "gotchas" to frequent, they wouldn't be gotchas any more. It's also not one family (hope I'm not spoiling anything here). Kareem's chapter was, IMHO, the low point of the plot. IIRC, you shouldn't even really know what the plot is all about, yet. You have three very good chapters coming up next, though, so hang in there. The chapter after is so so (interesting, but not great), then you have three more really good ones. Sadly, there isn't much to the last chapter, and it honestly gets a little tedious till you get to the boss fight. The boss fight is fun, and can be kinda tricky (not gonna say why, cause it's a spoiler).
Finishing the game, you'll know 98% of the story. You'll have to finish it 2 more times to get that last 2%. The other two times through can be tedious, because the game doesn't vary enough between the paths. I can't say whether it's worth it: it depends on the type of person you are.
BlackGriffen