Guys, arguing about opinion is really not going to get anyone anywhere Some people liked how OB went, some didn't. Each opinion is valid, and I hope that if OB disappointed you, that SA 4+ will be more what you are hoping for.
I, personally, would do a reread of the entire series, checking for foreshadowing and hints as to things that you didn't expect, to see if they are there, before claiming they shouldn't be there, but that's me.