I dunno man, I like everything about it, personally. Of course I would've liked new models, etc. Although I think we'll get some models through Beastgrave. There are new brutes illustrations. But you can't have everything. Orruks are nomads, they destroy everything they see just to prove their supremacy. A piece of terrain would make no sense when you think about it. I hope in time you will see all the options we now have. I'm extremely happy with it because we have so many options and so many builds possible now. Orruks are finally true beasts in close combat and the key units are terrifying, as it should be.
Before the book, I wanted to go with another army because I thought IJ were too one sided. It was mostly, do the Waaagh bomb, and pray you wipe the opponent. Now with the new book, I feel like we can finally play strategically and more long term in the game, it's less of an all-in or nothing and more of when to use which tool. We have a great arsenal of varied tools available to us and it feels great. That's my opinion though, of course.