Several opinions on this. I play solo and I like to build, so my play style is slow. It really comes down to what you like to do and what you want in a survival game. If you don't mind grinding for resources to build structures and over prepare for your next fight, then playing solo is do able. Fighting can be very tough in solo, but many have done it. Everything will take longer and you will more than likely die many times, but if that is something you are prepared for, then again, solo play is do able. If you don't like grinding or you like rushing through a game, then solo play may not be the best option.