I have not tried online, is it fun?
Have you played GTA Online? If so, it's similar: you complete missions to build up cash and "rep," and dealing with trash players who can one-shot you from across the map.
The setting is different, but the bullshit stays the same. This time, those trash players are one-shotting your ass in the dark, riding upside down on their tricked-out horse (it might as well as be a car compared to your little red wagon of a stallion), draining your health with a Mountain Dew sponsored shotgun they got with the preorder several years ago.
You're 200 yards away. How are they killing you so quickly? In multiplayer, logic flies out the window faster than you're flying off your horse and wounded on the floor. As you lie wounded, that player (dressed in nothing but a hat and underwear) shoots his gun tauntingly around your body, telling you how awful you are and how big of a dipshit you are for roaming around "his turf." You soon discern you're talking to a 15-year-old kid from Boston. Before you can say anything, he pumps into your dome. Lights out.
Rinse and repeat until you're back here bitching about the multiplayer and wondering why on earth anyone would spend time in that hellscape.