Im happy for the good parts (special character themed factions being a good idea to begin with, grave sites, deep striking through grave sites, special character formations, spell lores, fluff, buffs to black knights, good artefacts like the wristbands and the casty knife, good allegiance abilities like regen buffs, attack buffs, casting buffs, outflanking), and complain about the not so good parts (LoN units more dependant on Legion allegiance rules plus less interfaction synergy eg necros not buffing fec or tk plus no built in backwards or forwards compatibility together making mixed grand alliance death armies less workable now and in the future; few to no points changes despite blood knights, wight kings, etc being noticeably overpriced; no new formations outside of special character retinues; less good allegiance abilities like bringing back dead summonable units which costs reserve points and is thus basically unworkable in matched play, no new models).
I have been hearing more things i dislike in the last day or two, basically since we transitioned from official previews to advance reviews, but overall I'm still mostly happy with the book, and am excited to get my hands on it and start playing with it on saturday. There's more good than bad here, but that doesn't mean I'm not going to point out the bits I don't like.
Currently im leaning towards grand host, if only because that closest fits the models i like most and have in nearest to playable shape. Im working on 40 spearletons, 20 shield guard, 10 black knights, a necromancer, and a wight king. That's 1070, so I'll have to drop 5 gguard to play with them. If my motivation carries me through painting all of that, then morghasts will come after, maybe the big guy himself.