Even if it wasn't the best show in terms of consistently believable writing, what you just said proves it was still a damn good show: it's pacing.

I think the fact that Walt finds the keys in the visor in the cold open pretty much signifies that everything is going to go his way.

Walt didn't really get off completely free though. This all started because he wanted to provide for his family on his own terms, and wanted to deny Gretchen and Elliot's help. In the end, he funneled the money through them, basically asking them to take credit for his greatest achievement in life.

The title (Felina = Feline = Catlike) could also be a reference to the deaths in the Finale: Jack, Todd, Lydia and 6 unnamed Nazis. Also, while the machine gun is still going, a bullet hits a sign with the number 10 on it. Walt is the tenth and final person to die in this episode (if you sign Lydia off as already…