Does not look like it, since most are saying 2-3 range, which is the lower end of the scale. Dunning-Kruger would have everyone being a 4+.
Also the answers can be interpreted differently.
There are a few 2.5 and 3.5 answers here, which shows some are putting some thought and evaluation into their response.
Most that have responded with 4 or higher can give background to that response (which of course could be a lie, but that is different that not knowing where your skill is at).
If the OP had broken down what each thing meant, I think there would be and even more accurate score.
This is how I read them:
- None - is pretty clear, don't/can't do any thing to vehicle
- Some - basic maintenance (anything in the owners manual, oil change, air and cabin filters, wipers, maybe check and replace a fuse), things can be done with basic hand tools and minimal knowledge. youtube is their guide
- Decent shade tree mechanic - more advanced things such as brakes, all fluid changes, R&R attached engine parts (alternator, water pump, intake, valve cover gaskets and such), may need some more "advanced" tools (OBD code reader, maybe a low end scanner), most suspension and steering items, general knowledge of many automotive topics and more specific knowledge of own vehicles, OK diagnostic ability (may be a parts cannon at times, but not usually always). Probably uses youtube for some repairs, but may own a repair manual for specific vehicle. Has a basic 5-10 gallon air compressor, maybe a little better. This is a starting hobbyist level IMO.
- Really good shade tree - More advanced/specialty tools needed (general bi-directional scanners, welders, engine hoist) and knowledge to use them, replacing engines, advanced engine work (heads, exhaust (more than just external bolt on stuff), doing some A/C work, maybe some welding, never goes to a shop except for things that they do not have tools to do, good general knowledge of all automotive stuff, many makes and model knowledge (enough to hate a few brands and love others, but will work on them all if needed). Probably has a FSM for personal vehicles. Usually has a reason for replacing a part, not just "hope this is it". Probably works on other mechanical things as well (mowers, motorcycles, other motorized hobby things) as well as helping friends with repairs. Does this as a hobby as well as to save money. Probably has a "project" of some sort either finished (it is never finished), sitting in garage now, or future plans for.
- I am a mechanic - Someone probably with more than an attached garage, more equipment (probably has some type of a lift, maybe a brake lathe, good A/C equipment able to recover freon, Engine rebuilding, almost all vehicle repairs could be done), advanced diagnostic equipment and scan tools.
- I am a master mechanic - IMO this would be someone at an independent shop or dealership (or at least able to be hired there), ability (skills and equipment wise) to do any auto repair on a wide range of vehicles. Access (and probably own) any tools needed, welding, fab work, engine and transmission rebuilding, electrical diagnostic, ect, will warranty work, and while may not have ASE cert, could get it and probably get it, or even teach it.
There are some things that could fit into either category. Things like replacing differential gears could fall into the decent shade tree category if somebody has a need to do it often enough, but is more of a really good shade tree mechanic. Same for things like replacing head gaskets.
As I mentioned, I have done some things of vehicles that I would classify as a really good shade tree mechanic, but I don't think I really am, especially with the technology in vehicles today, you really need more specialized scanners to do some of it, and I just can't justify the $1000 for a diagnostic scanner (but have been looking at some in the $400-500 range).