The November 2017 issue of Chess lists the top twenty openings compiled from a list of 2402 September games where both players were rated over 2400 Elo. One can not take position on this list too seriously because it is greatly influenced by how the openings are grouped. For example, all the Retis are grouped together, while English is separated into 1...c5, 1...e5, etc. Nevertheless, for what it is worth, some of the list entries are: 126 Retis, 100 King's Indians, 97 Nimzo-Indians, 84 Caro-Kanns, 76 declined Queen's Gambits, 73 Slavs, 63 Catalans, 61 Najdorf Sicilians, 58 1...c5 Englishes, 55 Berlin Lopezes, 55 Queen's Indians, 49 Guioco Pianos, 48 1...e5 Englishes, 45 Kan Sicilians, 43 1...Nf6 Englishes, and 42 Taimanov Sicilians.
Is Caro-Kann playable in tournaments?
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I think that means that it is not that good. But I actually am not a high-rated player and the tournaments I play are unrated. I tried playing the Caro-Kann today but accidentally played the Pirc 
. This was my first time playing the Pirc and I won on time so I don't really know if the opening is worth playing.
All the openings that kindaspngey listed are playable including the Caro Kann and those openings have been played by many strong players.
Yes, it is a good opening. Especially against aggressive players. I've used the Caro Kann as my primary defense to 1. e4 for a few years.
I wonder if the Caro-Kann opening (e4 c6 d4 d5 and so on) playable in tournaments?
I'm new to this opening and haven't played it much so please give advice.