This is more or less the way I think of it, too.
For example in real life, a person with an intelligence of 8 can probably read at about a 4th grade level (the USA Today newspaper would be a struggle, NY Times would be impossible), they can surf the internet, but can't generally use a search engine successfully, they can drive, but might have a hard time understanding written or oral directions, they probably struggle with balancing their checkbook, and they are uncomfortable with people who "use big words".
A person with a constiitution of 8 gets frequent colds, has more aches and pains than the "average" joe, perhaps needs more sleep to function, and probably is allergic to lots of things. It might also imply a chronic condition like back pain or mild arthritis.
A strength of 8 means that you are frequently taxed to your limits doing the regular lifting and carrying of everyday life. One grocery bag at a time, picking up a toddler is either terribly difficult or impossible, shovelling snow is torture, and you have to have someone else open jars for you.
A charisma of 8 means (IMO) that a person is shy, unattractive or maybe has a problem like mild stuttering or severe acne. Although, stuttering could easily drop the charisma score to 6, since it can make oral communication well nigh impossible for the one so afflicted.
A dex of 8 implies a klutz, or again, maybe someone with arthritis, which inhibits swift movement.
A wisdom of 8 means that you probably are gullible, make bad decisions in affairs of the heart, and mouth off at really bad times. You might also take risks that the "average" person wouldn't. You probably think gambling might actually earn you money, succumb to chain letters and email hoaxes, and let your kids do really stupid or inappropriate things. You are an advertiser's dream.