Clash Royale should never ever ever ever ever be on any lists of greatness ever...
It's fun and entertaining unless you want to do anything at any higher levels (or really lower levels as higher level people keep dropping to fuck with everyone or so I've heard since I quit that garbage). Basically, it's worth playing if you're willing to toss a bunch of money at the game. That game is about as Pay 2 Win as you can get...