Contextual revisionism my friend. You're comparing apples and pears.
Martinez was pre-Mohiri funds, the other two post-Moshiri.
And before you waffle on about David Moyes- he was given ELEVEN YEARS to create what he did. And one of his finishes was 17th!
If discussing context, it would only be fair to point out that
Moyes took over with the club at fear of being relegated under Walter Smith, and in the previous 2 seasons had finished 16th and 13th. Martinez came in to the club after we had finished 6th and 7th in the 2 seasons before and then sent us considerably backwards after his excellent first season.
Moyes made us considerably better during his time here
Martinez made us considerably worse
Koeman had a reasonable first season then undid it all.
Allardyce wasn't here long enough to bother assessing him but in terms of league position took us up the league, albeit with dire football and the jury would have been out on him this season.
Since Joe Royle, Moyes is the only one who has been a good manager here.