I was having a few frustrations last week, so decided to say what the heck and picked up Shadow of War to vent some of it by killing large amounts of orcs.
Its enjoyable enough. Pretty much Shadow of Mordor once more. The first act is purely getting back into the swing of things in Mordor and re-learning all those skills,wile the scene is set in Minas Ithil (later to be Minas Morgul). Act 2 reintroduces the domination side and building up your own forces, but I have to admit, the much touted "leading your armies to war" is rather minimal and not that deep. Selecting different types of orc (tribe or class) has absolutely no real effect beyond the visual, and then you choose which of them are part of your "assault force", spend in-game money to tweak them from the same set of seige upgrades, and then run through a set of "capture the flag" points.
Story side starts wandering even further afield from the points known, and is entertaining, but it gets distracted by the huge amount of grind involved in taking on all the orc captains, getting the intel, setting them at each others throats and all that. Still, fun in its own way but I do see how this could get a wee bit tiresome after x point.
Ignoring the loot box thingy.
So yes, if you enjoyed the first game, you'll likely enjoy this because there really isn't that much different to it - Just the skill tree has been changed some.