There is nothing inherently wrong with Craigs List and I buy and Sell on there all the time.
What is wrong is not listening to that little voice in your gut telling you there may be a problem with a particular listing.
I would even say that if you do not have or hear that voice then CL may not be for you?
Until you hand someone cash there is no scam and if you do hand the cash over without doing all you can to be OK with it then I don't care where you are finding the rig for sale
the problem is with you not the listing service.
CL is merely an outlet to find and be found for buyers and sellers,if you don't have the stomach for it then don't use it but don't trash it for others too.