No, "Spirit: Stallion of the Cimarron" it is not. I can see why fans of the movie are disappointed (offended just screams snowflake to me) and yes, historically it is not accurate in terms of fashion and life in frontier America. There are anachronisms aplenty.
BUT it's a children's show about girls who go on adventures with their horses and learn important lessons in friendship and life.
Yes the animation is somewhat lazy (limited character types) but I would argue that the storylines are original and interesting. There is humour and some very touching moments too.
I really enjoy it as does my 4 year old daughter. And the 3 protagonists represent all kinds of girl, from girly girl to tomboy and all independent, intelligent people who are kind and loyal to their friends with an accurate amount of teenage attitude I'd say.
It really doesn't deserve the bad reviews it's getting here! The toys (barbie type dolls) are crap so buy the Playmobil stuff as this is good.
Or don't buy the toys and just enjoy a wholesome kids show about young girls and their horses.
Just chill out a bit about it!