So I just finished the For Honor campaign. Just in time, as the free weekend ends in a few hours.
Took me about 7 hours. Overall I found it to be... Not bad. The story is not very strong, but good enough to be better than nothing. The graphics were great, though I wish you could disable chromatic aberration.
The gameplay is... Weird. I think even after all this time, I couldn't quite grasp it, and would probably be horribly massacred in multiplayer, if I was into that. It is kind of QTE-ish, but slightly different, I'm not entirely sure I'd call it that. I can definitely see why people abandoned the game soon after launch, though. I don't think I'd be able to handle it for much longer. There's just not enough variety in this kind of gameplay to make it interesting for too long.
I'd recommend this for people who liked Ryse, for what it was. Of course, if you're in for just the campaign and missed the free weekend, I recommend waiting for another, or for a severe price drop.