Just joking mate. I dont think you got it though.

I agree there are lots of shonks out there.
There are lots of good workshops also that get stuffed around by customers who feel they can give a shop a bad rep, just because things didnt work out the way the customer was hopeing. Workshops can't perform magic.
The old saying goes " The customer is always right"
Now this isnt directed to anyones post, its just examples.
You ask a tyre shop to fit specific size tyres, but yet are unhappy when they scrub on the body. Who's in the wrong?
You tell the mechanic, your mate checked it and its the startermotor and to change it.
Mechanic changes it, still same problem. Who's in the wrong?
NRMA checks the car and tells you its the fuel pump. You tell the mechanic to change it. Still the car doesnt run. Who's in the wrong?
All these problems and the workshop is given a bad rep by an unhappy customer.
All these from the start you could of had the mechanic double check the problem. The mechanic might charge $75 an hour for diagnosis and you think bugger that just change the $120 part from the start. But you could get the mechanic to check it, might take 15 minutes, might take 2 hours. Might be a $20 part, might be a $200 part.
If they check the part you said first and its the fault. The cost might only be $20 labour and $120 for the part.
If you straight out say change the $120 part to start and then it still takes 2 hours to find the real fault is a $200 part. Looks like you just wasted $120 on a part you didnt need and the shop still gets an unhappy customer, but yet the shop did exactly like the customer wanted and also fixed to broken car in the process.
Who's in the wrong.

Not all workshops are shonks.
Not all customers are right.

If you get something fixed and its still faulty. You have a right to complain.
If you get your car serviced and 2 days later your left passenger electric power window stops working - you dont have a right to complain.
But yet you will be suprised how many people try to complain and then proceed to tell everyone of the shonky workshop.