Many of those prophets that you have mentioned, Lady, God Almighty Himself visited.
he sees the form of the LORD
God Almighty revealed Himself directly to Moses,David,Isaiah, Elijah, etc.
Basically most if not all of the prophets unteracted directly with God.
Why didn't God reveal Himself directly to Muhammed?
Why just a vistitaion from an angel?
Whose to say the angel wasn't evil and lied to Muhammed?
Whose to say the Quran was truly from God?