It starts out great but that's probably just to get new players to play more, as you get more experience in the game you discover it's not all that good, you after a certain point you need gems to even progress and even then it's a hit or miss after paying to win a level, as for the arena mode most of it is just bots, why else would arena matches be instant and you'd have the ability to restart an arena match? If you could do that with human players, they'd restart you back until they'd win.