Sorry, but password complexity matters a great deal. When a website's passwords get hacked, they're going to compare hashes and find all the easiest ones first (password, hunter2, 123456, etc). If yours is 15 characters of random letters, numbers, etc, yours will not get cracked first. Now, if someone like the NSA is targeting YOU, then it doesn't matter how complex it is; it will get cracked. But in a list of 5,000,000 passwords, having a complex password can help make sure yours is not one of those cracked.