no, it is not a general inspection. it is an appraisal. the two are not interchangeable. yes there are minimum property standards for an FHA appraisal but it is not an FHA home inspection, hence the name. did the appraiser in your case miss some items? it would appear so, but like any other profession in the world appraisers are not infallible.
you stated you made an agreement with the seller to let the appraisal serve as a basis for needed repairs and that was your first mistake as it is an appraisal and not a home inspection. similarly asking someone on here to perform a review of your appraisal highlights that you don't really know much about the appraisal profession or how it operates. i typically charge double for a review vs a standard appraisal as there is considerably more work involved. if you want the report reviewed then hire a local appraiser who is familiar with your market to do so. bear in mind the results of that review will have no impact on your appraisal or purchase as far as FHA is concerned. if you feel there are inefficiencies with the report there are proper channels to go through to voice your concerns, however an online forum is not one of them.
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forgot to add this part...
fwiw you are not alone. i purchased my 56 year old home 3 years ago and it had not had a single update in 20+ years. i removed everything right down to the studs including the 18" plaster boards (built before drywall was prevalent). i replaced subfloors, all new plumbing, all new electrical, all new HVAC (except the ducts), added cac, new roof, new windows, new flooring, new kitchen, new baths, new lighting and fans, new sump, etc etc. aside from the studs, foundation and aluminum siding everything in the house was brand new. i refi'd after the construction was complete and the appraiser rated it as a C3.