Personally, I have nothing to criticize COD Mobile. I started playing it too because my friends were very very engrossed in the game and I was thinking "What good will this game have?" Since I played it I completely fell in love with the multiplayer mode. For some reason, my phone would get pretty hot in battle royale so I preferred to stick to multiplayer and then I switched to ranked mode, which was basically the same thing but with ranks XD.
The only thing I could "criticize" is the absurd amount of space it ends up consuming on your phone.
I also get quite hot when I play in battle royale but I don't know if it's the lack of power of my phone, however it works quite well even though it looks like an oven hehehehe.
Thanks for commenting 😎