Jumps in difficulty become maddening to the point of making the game more frustrating than fun. Either you OP to deal with bosses and all other combat is dull, or you take missions at your level and the occasional boss fight will be either a long, repetitious slog wearing down their implausibly high health, or you suddenly dying when two quick blows before you recover take off most of your health.
And don't get me started on mercenaries. Who thought that made the game more fun?
I deleted the game out of frustration and disappointment about 10 hours in. The story was better than most, but not enough to make up for a shoddy game.
AC has run its course. Deep six it.