No it is not if you assume people who crack passwords are dumb and brute force everything. Second part you assume people are good at making random words on the

No it is not if you assume people who crack passwords are dumb and brute force everything. Second part you assume people are good at making random words on the spot, if you make password for linkedin, probably many will end up "linked blue somethig". In reality brute force is last resort, you have dictionaries, walks on keyboard. You can also use additional data about your target if you have database like name etc.