The Chinese ones that are current (written on a computer) but awful (probably written in Word, by ESL writers) are pretty annoying.
Think one of the oldest datasheets I've seen dates back to release rev in 1968 or something like that. More and more revs added over the years, but the same basic part (or part series). Some Molex connectors are like that. Hand drafted? Who cares. As long as the scan is good (the above example, not so much..), the drawings themselves are usually correct and understandable.
Tim