Even though I have a slight ( 

  understatemnt of the year) obsession with Home on the Range, I do admit it does have some weaknesses.
However most of the complaints I have heard about this film are pathetic, some of the complaints that I have heard, and have argued are:
1. It's badly animated.
Just because it's different, doesn't make it bad. Ok cows with points and 90 degree angles do look a bit odd the first time you see them. It's art! Just becaus ethey're not fluffy rounded critters like brother bear or the lion king so what! Now if they meant the cows to look round and fluffy and this was the outcome, then maybe you could say that.
2. It looks flat and simple.
Hello! It's an artistic style people.
3. It doesn't seem like a Disney movie. 
This is the one I hear most, and my reply is so what? It doesn't feel like a disney movie therefore it's bad?
4. It's only 75 minutes long.
Ok I agree I was disappointed by the short running time, but so many disney films have a shorter running time than that! And I think it is pathetis to judge a film simply by its running time, the film doesn't need to be any longer, it does the job in 75 minutes.
5. 3 cows chasing a cattle rustler is a weird idea for a film.
Really? What even weirder than:
Mad woman wants coat made out of puppies
Elephant learns to fly
Chinese woman dresses as man and joins army
Bear takes boy to village
Princess flees stepmother and moves in with dwarfs
Lion is framed for his father's murder
Allien crash lands on earth and makes friend with hawaiian girl
It ain't that weird an idea, it's basically the pied piper of Hamelin with cowboys!
I think that one major point in the failure of Home on the Range is the fact that the story is not like a modern animated film. It is not a grand epic atory like Mulan or Tarzan or The Hunchback of Notre Dame. It is a sweet little film that does not try to be a great epic and I think that is why I love it. I think Home on the Range is more similar in terms of content, plot and story to films like 'The Jungle Book', 'The Aristocats' and '101 Dalmatians'. 
I also think it's artistic style was to its detriment, I honestly believe that CGI has won people over for the moment, If HOTR was CGI I bet it would have made at least $100,000,000. I think people see traditional animation as childish whereas CGI is something people any age can see. For exmple I have a friend who said he would watch Shrek, Ice Age and Toy Story. But not anything made by Disney because traditional animation is for kids, Which is a statement of pure insanity in my opinion. Also how else can you explian successes like the travesty that was Shark Tale. I honestly believe that people will get sick of CGI and soon 2D will start to come back though.
I may be alone in my liking of Home on the Range, but I do not think it is bad at all, and like I say people are probably a bit 'what the hell?' about it because it is tame by the standards of modern animation, and as i said i feel it is very similar to the films like the Jungle Book. 
Almost Every film released by Disney in the 2000s has either been rubbished by the press or has been a financial failure, however I do not think that there has been a single bad film amognst them, Everything from Fantasia 2000 to Hotr has been fantastic IMO and I would rate them all in my top 20 at least.