Pro Tribal aspects
Users can form a tribe with other online users to for a community. This community can now band together in order to build and grow as well as team up against other tribes. This makes for a fun experience with friends and other players as it requires teamwork in order to be successful.
Con Anti-cheat issues
ARk has started using an anti-cheat tool called Battleye, this has so far broken Linux and Mac support for using official servers. Battleye has also had some issues with banning legit users and does not have a very good reputation. These issues add up to many angry players who paid for the game but now can not play it.
Con Early access
Ark is an early access game meaning it is basally in an Alpha or Beta state. Bugs are easily found and many areas of the game lack polish. While t may not cripple the gameplay this is something to consider when purchasing as there is n guarantee the game will ever be finished.