Cardinals are a legit good team

I agree. The Cardinals are a legit good team. Every reputable analytics site has them rated anywhere from 4th to 10th overall. On Football Outsiders, they're one of two teams so far (w/ CLE) whose offense, defense and special teams all rank in their top 10.

The Rams are rightfully favored but it's not a gimme game at all. Being their first division game and the last home game before playing 5 of the next 7 on the road, it's very important for the Rams.