Well, the correct templates and fonts should be used, and the spelling and grammar have to be error-free. Because the MT has a quota to meet, the race against time can cause errors, hence the need for editors. Some of them are really good; however, there are editors who refuse to think, most likely because they do not understand what is being said or simply do not have the IQ or even common sense. All they care about is what their ears tell their brains. Perhaps it's because they spent years memorizing all those body parts, medical words, and the like without really understanding what they've been trying to learn.
Here's a quote from an edited file. Note the tense inconsistency, then try make some sense out of this sentence:"Unfortunately, he did not require any hospitalization nor developed any febrile illnesses in the interim."
You mean the doctor or whoever dictated this wants the patient to end up in the hospital or have some kind of fever? Hmm ... sounds like a hospital stockholder, a sadist, or both.