The game is the best hunting game ever, as graphics and realism are!
It is different from theHunter Classic, which is a MMO and pay-to-hunt.
Call of the Wild is one-time purchase with paid DLC later on (more animals, more weapons). You can hunt every animal and go everywhere in the game. Patches are coming soon to fix most of the day 1 problems.
If you like the game, buy it. It is only 30 EUR and have nice multiplayer, if you like other people to spoil your game...