1. Yes, if you tame 1 or 2 star boars, they will drop 2 or 4 meat/scraps each.

2. Taming is more worth in mulitplayer when you have to feed 4-7 people who have less time to hunt their stuff or do other tasks. It really makes sense to have kind of a farmer in a big group.

In singleplayer, I'm more excited to hunt my stuff, aside from the basic aesthetic aspect, or to bring more life to your village if you want to build one.