My problem with arena is that it's scaled wrong. You don't get daily progression/quests, but that would be fine if it wasn't so unrewarding with the time you invest. You need 5 wins to go infinite, thats equivallent of 10-13 daily points. For the first 10 wins, you get 100 ore + 4 rewards of 15 something or a card, while in arena, you get 1 free keg for that? No thankyou, I'll rather play casual/ranked because it's safe and even gets me more stuff if I don't have time to play a lot.
Either at least double the entry fee&rewards (I personally would triple), because compared to something like HS, where your daily gold gain is on average below 100, in gwent you get 300 per day easily, but arena entry is the same. Or just enable daily rewards for arena if you are to keep the current format.
And this is coming from someone who enjoys that games have a lot of different formats. I am really sad that arena crushed my expectations...