For me, and I stress that:
A rating of 5 would equate to a classic song. You can't get better than a 5.
Are these songs really on that level?
5's are those are songs that don't HAVE to be hits (but most likely are among favorites of fans). E.G. Crackerman, Dead and Bloated. Most STP fans I know love those songs. Trippin...even lesser knowns that are just really well done like Kitchenware and Candybars, Atlanta, Seven Caged Tigers, Tumble in the Rough...just great STP songs that everyone loves. Also songs like Vasoline, Wicked Garden (the monsters).
Having said that, here's how I would rate the songs I have heard, in terms of how they excite me and what kind of staying power they'd have.
Between The Lines 4.5/5
Take a Load Off 3.5/5
Huckleberry Crumble 3.5/5
Hickory Dichotomy 3/5
Bagman 2.5/5
I like these songs, don't get me wrong. I'm just not going apeshit over them.
Solid rock songs.
Edit: A reminder, who am I to dictate a ratings scale? Everyone has their own based on their feelings and the way the song moves them. This is strictly opinion-based.