I played it when it first launched: I would usually play Classic Multiplayer Mode since. It was so much fun, the controls are very optimized for touch displays. It's amazing how good the controls are compared to other mobile shooters.
Sadly I have since stopped playing Call of Duty mobile for two reasons: the first is sometimes you'll be paired with people who do not know how to turn off their mics when they're not using them for tactical reasons. I've had to listen to someone teaching chips in the background, babies crying in the background.
The second reason: as time has gone on since launch, a lot of the cheaters have flooded in the game making it less fun than it was when it first launched. Your typical campers who camp spawn points and whatnot.