I made the trek to Phoenix from Las Vegas to see my Oakland Raiders take on the Cardinals back in 2010 (the home opener). I was amazed at how friendly the Cardinals fans were to us; not quiet what I'm used to after visiting Qualcomm Stadium in San Diego.
The stadium was very clean and shiny and the staff was very friendly. Navigation around the stadium was simple. Whoever constructed this stadium was very detailed with the signage. The roof was closed for that game and I would imagine because Septembers in Phoenix are so humid.

I sat in section 235, row 6. There were only 12 or so rows in our section and I would imagine the same for every other club seat. The club seats have a private entrance; I remember we entered the area on the east side of the stadium. There weren't any hardcore Cardinals fans in our section that I could notice. Everyone seemed to be pretty laid back and just there to see a game. I found the crowd atmosphere to be very tame on the club level as a whole. I think you'll find the rowdies probably in the north and south end zones.

If you like being exclusive and sitting away from the drunken idiots, 235 will be a great selection. You're going to love this stadium! It's state of the art.