I agree but they also over achieved given what he had at his disposal.
In terms of what came before and after him I raise you Walter Smith, Ronald Koeman, Sam Allardyce, Marco Silva, Rafael Benitez, Frank Lampard and Sean Dyche, Howard Kendall 2, Howard Kendall 3, Mike Walker, Joe Royle. All have worse win percentages than Moyes.
Only Carlo, Martinez (that surprised me!) and Colin Harvey had better win percentages than Moyes since Howard Kendal 1 and the you are back to Harry Catterick !!
I will let Joe Royle go as he won the FA Cup and, well, he is Joe Royle