To be fair, the leaving his friends thing was never their intended path with him, it was a forced situation with the actor.
The broken home thing is definitely new.
I don't know where you got the he wasn't a thief thing, he absolutely was. If anything went missing in the Two Rivers, Mat was immediately the first suspect and he freaking stole the Dagger in the first place lol
The born to a Forsaken thing is obviously unreliable narrator. Ishy thinks Mat is corrupted just like he thinks Perrin will succumb to the Wolf and we both know Perrin fights losing himself to the Wolf for the vast majority of the series. Just because he thinks Mat is corrupted, it doesn't make it true.
Mat talks like a coward all the time in the books...no way I'm getting involved in someone else's fight or saving the girls from trouble, not this guy, I'm going the opposite way mark my words, they can get out of it themselves...very next chapter there's Mat not only fighting to save someone's life, he's leading the charge.
The reality is the only real changes are his harder home life and the out of the writers hands leaving his friends bit.
Anything else is like trying to get water from a stone and more about being a hater than a critic.