Prison Architect is ok I guess, I didn't like it but my friend has about 100 hours in it. Depends how much you like management stuff I guess. Planet Coaster probably similar, if you like management stuff you'll probably get worth out of it
AC:O is probably ok if you liked the others? I'll probably buy it when its dirt cheap. Black Flag is the only recent AC I can recommend.
Factorio looks incredibly boring to me but I know people who have spent a thousand hours on it. Watch videos of it on youtube, that will give you a good idea.
Arma and Cars, if you're into them you'll love them I'm sure, I've heard good things about both. I'm not into those sorts of games though.
Not the "Get this, don't get that" you were maybe looking for :p
I wouldn't personally buy any of the games on sale, but your taste in games is probably different to mine so just being as objective as I can.