Whats it like living in Phoenix?
The following are only my opinions:
Vibe - Depends entirely on where you are, and what circle of people you tend to gravitate towards. If you spend some time looking, you're likely to find a solid core of like-minded people just about anywhere. As a state, and in terms of multi-generational residents of the Phoenix valley, the majority of the sentiment is strongly conservative, but it feels like downtown is a more urban-professional vibe, with plenty of young, hipstery, artsy, liberal neighborhoods mixed in.
Traffic can be pretty insane during peak hours, which seem to be from 7am-10am, then 5pm-8pm. Avoid all major highways going in the direction of downtown in the morning, and likewise those going away from town in the evening, and traffic is quite bearable.
Summer is extremely hot, normally from about mid- June til sometime toward the end of October. Get used to a minimum of 100 degrees with ~2% humidity during the day. Most folks stay in air-conditioned environments as much as is reasonable in the summer. Personally, I love the dry heat, and most folks who are realistic, and successful out here have similarlly embraced the weather patterns. If you tell yourself it's too hot of a place to survive, then you'll probably be right.
Job market is extremely hit-and-miss, but that's the case almost anywhere. As mentioned by others, retail, tech, customer service and callcenter work are by far some of the easiest fields to enter, but if you're resourceful and persistent, there's likely something for anyone out here.