why are dodge transmissions labeled as crap(no offence)

well i get alot of crap in my area about that dodge transmisions are crappy. that they always go out and such, my friend is gonna by a 2000 jeep witha 4.7 auto, would this also be a truck prone to the bad transmission. I wasnt sure where to put this and cant find anything on google. Why do the transmisions go out, is there a way to solve the problem, does anyone know of a write up i can read to better understand this. Also the older dodge trans 727/904 from the 60s-70's arnt bad too are they, i havnt read anything bad about em. can someone give me some pointers here?