ATTENTION: THIS POST CONTAINS SPOILERS FOR BROTHER BEAR. IF YOU INTEND TO WATCH THIS MOVIE, PLEASE SKIP THIS POST...
Personally, I'm not a big fan of the trend in "children's" movies to try to cross over to adults by including adult humor, banking on the fact that it is obscure enough for the parents to get it but not the kids. That Bob & Doug didn't engage in that sort of thing speaks very well of them and, in that regard, I'm glad that Disney showed a bit of restraint. That said, watered down Bob & Doug is about as good as watered down beer. I didn't find them all that funny - and I am very much a McKenzie Brothers fan.
Regarding the violence in Brother Bear, I honestly don't see what Atlantis has to do with it. That the violence has a direct bearing on the movie doesn't change anything about my opinion.
First, the youngest brother sets out to kill the bear. He wasn't hunting for food here, he was maliciously and angrily trying to kill something. That bothered me.
Second, the older brother dies while saving his younger brother and the reaction of the younger brother is go back out and, once again, maliciously and angrily try to kill.
Third, he finally succeeds in killing this bear and then is magically transformed into a bear himself.... whereupon
Fourth, the other brother now decides to angrily hunt down and kill a bear. In fact, brother #3 becomes downright obsessive in his quest to kill this bear - who happens to be his brother.
Fifth, they introduce the little bear... who, it turns out, the youngest brother was personally responsible for killing, for no other reason than anger.
These are not the kinds of things that I want to expose my 3 year old boy to. While I do not demand that movies teach my child about life (that's my job), I do expect that they keep their audience in mind when writing or considering a script. Had the script been altered so that the brothers were hunting I would not have had as big a problem with it. Hunting for sustenance is a healthy concept and a necessary activity. Hunting something for no other reason than malice is a trickier proposition altogether - yet that's precisely what Brother Bear showed time and again in that movie.
I didn't appreciate it at all - no matter what happened in Atlantis (which I'm also not a fan of).
You are correct that most spiritualism is confusing to children and you're also correct that deeply exploring it in a Disney movie would have had religious whackos up in arms... so it is probably better if you don't make it one of the central themes of the movie, is it not? In Brother Bear, however, Disney decided that it should play a prominent role.
Lastly, no, my son does not have any brothers or sisters (yet) and, yes, bickering between siblings is fairly normal... but that doesn't excuse the fact that throughout the vast majority of the movie the ONLY interaction between the siblings was bickering and fighting. Well, when they weren't hunting each other, that is...