Clearly I'm not making the argument that jjjjjjjjjjjjjjjjjjjjjjjjjjj is a recommended password. Of course it isn't.

Use a long, complex password. Period.

However practically we know the history of password crackers, and while it's easy to look at specific examples given and say "Oh I would totally crack for that", in most general cases they wouldn't be cracked. On the flip side, passwords that are dictionary words following by numbers and or punctuation are cracked because they are exactly what people migrated to once complexity rules were implemented.