Depends; in a harsh winter, or in less bountiful climates, such as the poles or deserts? It's pretty rough getting a meal some days.
Especially if yeu have 20-30 people to feed, and all the other animals are fighting for food as well, and wolves, bears, and other predators, are far better built and designed for hunting than humans are.
When yeu're down to only about 50 rabbits in the area, and yeu have to feed 30 people every day, yeu run out of rabbits awfully fast.
The reason for the agricultural society, is that it was sustainable, the food stores could be preserved easily to last through winter whereas meat went bad unless it was heavily salted, and then it tasted like crap. Or salted crap. Whotever.
Thing is, as yeu get more people in an area... let's say a city of a million people... see if yeu can find enough rabbits within 1 day's walk to feed every last one of them. As yeu grow in population size, it gets harder and harder to maintain food supply via hunting alone. Agriculture just works out better long term with more people, and, although still prone to complications with weather, it's still more stable than trying to hunt.
It's also hard as hell to chase anything down when yeu're starving from lack of food for 4-5 days due to crappy hunting, no energy means no energy to hunt, which means no food, which means no energy to hunt with... nice little cycle there.
As such, yes, if yeu were worried about ONE person for ONE day, hunting down a single rabbit may not be too hard. If yeu're trying to support a small society for an extended time, it doesn't work so well.