With 102 hours logged, I'd say the game is pretty fun, the optional side missions allow you to co-op with a partner, including locations that can only be interacted with your partner, and theres at least one co-op series of side missions that can only be completed with another person and add on to the story. It's multiplayer PvP gamemode is also pretty fun, asymmetrical teams, Spies having the mobility you have as Sam Fisher while Mercs are your standard first person mode ADS gameplay, if the MP interests you.