Clash of Clans is the most downloaded smartphone game. However it has some cons:
The app takes up a lot of space in my phone. I had to get rid of lots of amazing things to play this game.
It slowed down my phone drastically. I had to install a speed booster to play this game properly.
You cannot play it without Internet. Thus, I had to pay a lot more for Internet.
The graphics quality isn’t amazing. It all feels like blocks.