A painfully grindy and repetitive mobile competitive game with trash balancing and unfair matchmaking. That's just the tip of the iceberg.
1. Fake multiplayer
Until your brawler reaches 500 trophies, you are more likely to be matched against bots. It makes sense because you can't see saved videos for characters with less than 500 trophies.
2. Balancing
Some "brawlers" are better than others at fighting eachother. When a character comes out they can have something overpowered until many f2p players unlock it. Example: There was a star power (unlockable power-up for level 10 and up) for the character 8-BIT that could respawn you with a forcefield and full ammo. It wasn't even fixed that quickly.
3. Gameplay
On showdown, you play with the most pay to win brawler, team up wih someone and hope they don't kill you and/or hide until 2 players/teams remain.
On 3v3, you either have friends with strong enough brawlers or hope that your teammates aren't "randumb".
Stay away from Timmy, he has 69 terabytes of brawl stars porn.