Most people (esp non-HNers) don't, they just let Comcast set it up. To make matters worse, they set the SSID to my last name, and the password was my address. Maybe that's one-off, but if standard, seems problematic.
I can confirm that two different ISPs have done this with my initial WiFi setup over the last few years. AT&T made it the initials of everyone staying in that house with the password set to their 800 number for service calls. Time Warner made it one person's first name and the password was his cell number.
On the other hand, a Midcontinent Communications (aka Midco) tech told me the password I wanted to use wasn't secure enough and brainstormed with me for a couple minutes on good SSIDs and passwords while he showed me the web admin interface on my laptop. I was very pleased with his visit and called the local office afterwards to pass along kudos!
I haven't seen a telecom-provided wireless setup in forever that didn't have the default password be fairly long and random, printed on a sticker on the back of the router.
On the other hand, a Midcontinent Communications (aka Midco) tech told me the password I wanted to use wasn't secure enough and brainstormed with me for a couple minutes on good SSIDs and passwords while he showed me the web admin interface on my laptop. I was very pleased with his visit and called the local office afterwards to pass along kudos!