The most interesting regime in the game is matchmaking. This is the only gameplay n this game that has a purpose. In Counter-Strike Global Offensive the ranks are very important, and this is the only regime that influences your rank. Also, there are a lot of interesting minigames, and modded maps, with some interesting features. There are a lot of csgo gambling sites where you can use your own inventory to make some money. When I was younger I liked to watch eSport about this game, and I usually was making bets on the matches with my favorite team.