Right now, the Gauntlet is almost not worth doing. It's 50 stamina per entry, and there's no reason to go beyond lvl 1 for purposes of the complete a Gauntlet activity. This is because of the 30 second long wait time between levels (unnecessary) and the low amount of rewards. Whenever I get it in my activities, I just complete the first level and immediately quit. I don't even do the Gauntlet as a casual activity because the feed amount is just not worth it. The fact that there's a cooldown also means I set it aside in a different tab and need to continuously check in on it instead of being able to go through as many levels as my team is able to.
My suggestion is to allow the Gauntlet activity to be marked as completed per "level" finished instead of per entire round finished. This encourages people to keep their Gauntlet run open to slowly complete higher and higher levels as the activity loops back around to it again. It would also encourage people to create better well-rounded teams since it's much cheaper stamina wise to be able to keep going to higher levels instead of quitting immediately upon completing level 1 just for the activity reward.
Let me know what you guys think. I love the Arena, I love the idea of the Gauntlet, but what it is right now is just not worth it from a gameplay aspect. Give me a reason to use it, please!