A very underwhelming release for sure. Models sucked overall (Doombull was ok), and that Battalion blows.
However, the army itself is pretty damn good. Lots of cheap, mobile Core backed by some solid characters, Specials and Rares.
Ambush is a big departure, I'm not a fan of the overall randomness but going on turn 1 is pretty handy. Use it for cheap Gor/Ungor units to hit flanks.
Lore of the Wild has some handy spells and with the buffing Brays got (especially that flying fella) Beasts actually have a good magic phase.
Gorebulls are murder machines, stick 'em in a unit of Gors for Fear protection and munch on stuff.
Gors themselves have WS4 and T4 going for them, but it's best to keep them in MSU style unless they are escorting a Gorebull.
Ungors are decent flankers, kinda meh when skirmishers are so useful.
Hounds rock as always.
Tuskgor chariots are cheap and smashy, it would be easy to make a Core out of just these.
Minos are unimpressive, Frenzy and no real protection hurts. Razorgors are so much better, despite having an even more atrocious model.
Razorgor chariots are win, Harpies are win, Bestigors are fail.
Cygor is super useful, Jabberjaw is win, Ghorgon is meh (good stats but Frenzy is fail), Giants and Spawn are fail.
It's a huge improvement, a lot like the Tyranid Codex (which, IIRC got poo poo'd when it dropped too). It's revamped the army and made it something different, so you'll basically have to relearn it. Try and run it like you did your old armies and you will be disappointed.