With a name like crusader kings 2 you might be forgiven for thinking that you can actually do stuff that a king does. And eventually if you are patient enough and the huge amount of detail and tutorials doesnt make you want to smash the game to pieces you will enjoy it. You will eventually take over a couple of pieces of land and all is well. But really this game isnt about attacking other people its simply about you having to deal with you vassals. God knows why they bothered making them all seem a little individual, all they do is revolt. You're enjoying you time attacking other kings but in the end your spend most of yuor time just putting down rebellions by every vassal because they are never happy. I enjoyed my time on this game but im no so very irritated that i just cannot be bothered anymore.
Fun for a bit but trust me, a game where you effectively have to use vassals and give them the land is fine, but when they always rebell after awhile is pointless.