It's hard to say for sure about the quality of transcriptions, because when we read stuff, we already know what we are looking for, as opposed to the transcribers who will see hundreds of disjointed names in the course of a day. Quite often we see threads on this forum asking for help to read handwriting on documents, and it's only when someone else "cracks it" that it becomes blindingly obvious what it says. Of course, there is another problem on the 1911 census - on all previous censuses, we only got to see the emunerator returns, so you had a whole page of writing in the same hand, to make comparisons, and the emunerators (on the whole) had fairly good handwriting. On the 1911 census, the entries were written mainly by the householders themselves, or a child in the family who could read and write, so you will only have a few lines in the same hand, and often the handwriting will be very poor.