Neither of those games are hack'n slash. The way I've always understood it, hack'n slash is the same genre as beat'em up, just with swords. They're both a subgenre of action/adventure, with a greater focus on combat, combos, finesse, and mowing down countless enemies.. Usually with a high number of attacks that can be combined in a variety of unique ways for greater combos and bonuses. Basically, think fighting game meets action adventure, and you pretty much get the picture.
The new GoW, and For Honor, have more in common with Zelda and Souls than traditional hack'n slash. For Honor adds a layer of depth to the guarding and parrying system, while forgoing dodging, with a primar focus on 1v1. The footage we've seen of GoW4's basoc combat so far looks remarkably like TLOU, and I don't just mean the camera. Mash attack button over and over, and then Kratos performs a brutal finsher. There is rolling, though, and I'm sure there will be more exciting moves later in the game. Also, here's hoping for a hard mode where enemies actially parry your attacks.
Shadow of Mordor iz closer to a hack'n slash than GoW4 and For Honor.
