You may also find that although the record has been transcribed you won't find it due to error.
Last night I went to ancestry's 'All London, England, Births and Baptisms, 1813-1906' and for the umpteenth time picked a forename, (Mary in this case), and entered it in the Surname box, and nothing else. Of the 50 that came up on the first page, only a handful really had the surname Mary as written in the Register. About 40% were wrong due to 'Mary' being entered by the transcriber in the surname box - and nothing else. Other errors are due to the transcriber not reading far enough along the line to realise that there was a surname there, And far too many clearly written May, read as Mary.
I reckon that c.35% of the 50 were wrong.
The same applies to any forename you care to think of and investigate. I've corrected several dozens, (a couple of thousands in all of ancestry's dbs - it is a serious failing).
I don't know who is the bigger villain. The LMA for grossly negligent lack of oversight or ancestry for publishing the work without proper investigation of its accuracy,
Having said that, overwhelming number of items have been properly transcribed and I'm grateful for previously unkown folk I've been able to find.