I wouldn't necessarily put that much stock in the skill rating in an isolated context. Sure, it provides a handy reference point for what a character might have trained for (i.e. a person with Rating 6 in any firearms skill has clearly worked with his chosen weapon enough to be considered a professional), but without the associated attribute and/or modifiers it doesn't really give you any specific indication of how good a person is at performing skill related tasks. General idea, sure, but not specific.
Take both extremes; a character with Skill 1 and Attribute 1 vs a character with Skill 1 and Attribute 10. The former is unskilled and has little natural aptitude, while the latter is just as unskilled but has significant natural aptitude at whatever the task at hand is. The same could be said if the skill was 12 instead. Two people of equal skill level, but one is more proficient than the other.
So really, if anything I think those categories are more of a reflection of how much education/experience it takes to get to where you are. Bullets & Bandages has a specific example for the Biotech skill ratings:
Skill Level | Example |
0 | Untrained: Has some basic knowledge of anatomy, but nothing more |
1 | Beginner: Person who took a CPR course or learned some first aid as a Boy Scout or something |
2 | Novice: Med student, new hospital orderly |
3 | Competent: Good student, but not up to advanced coursework yet |
4 | Proficient: Intern, certified nurse’s assistant |
5 | Skilled: Resident, licensed practical nurse |
6 | Professional: Doctor or registered nurse in practice for less than five years |
7 | Veteran: Doctor or registered nurse in practice for five years or more |
8 | Expert: Leader and/or supervisor in a practice or hospital |
9 | Exceptional: Award-winning practitioner, recognized in trade magazines as one of the best in their field |
10 | Elite: Top-flight practitioner at elite facility or university, sought after by wealthy clientele |
11 | Legendary: Pioneer of new, cutting-edge medical techniques |
12-13 | Apex: The absolute tops—CEOs of the megacorps fight each other to see these people |
If you look at what B&B considers a "professional", you'll understand why I'm a big proponent of lower dice pool games. If a Biotech Skill Rating of 6 represents a doctor or registered nurse with at least 5 years of practice, what does a Skill Rating of 6 in Handguns, Hardware, or any other skill represent? I mean, that's years of study in addition to years of practice. But again, you could be a doctor or registered nurse with low or high Logic, which directly affects just how good of a doctor you are. And then there's Etiquette; no etiquette skill could mean you have poor bed side manners, whereas a high etiquette skill could represent the opposite. (Dr. House comes to mind as an example of a high logic and biotech skill but low/nonexistant etiquette character, for instance).
In short, I wholly support looking at the character sheet as a whole instead of as a collection of individual pieces, as I feel this more accurately represents what a character is all about. And as for the skill ratings, well, that's wholly table dependent, again. Some agree with the ratings, others don't.