I've probably done half of my 320hrs alone. It's honestly fun to have a tag along player, but completely subjective to your needs. Playing alone is awesome. You really immerse yourself and have a higher level of survival. Playing with friends is great and takes the load of scavenging down a bit. But also increases your overall useage of foods and resources. There are always people who want to play and suggest going to the forum and asking if people want to play. But be warned, trolls and overall douche bags are a concern and can make things a bit frustrating for you.