The current reward structure for Alliances during PvE events is honestly pretty yawn inducing. For these PvE events you have tens of thousands of Alliances vying for position on the ranking board and only the top 100 get anything meaningful. Take the current PvE event -
1-2: 2000 
250 
and Spiderman 
3-50: 2000
250
and Spiderman
51-100: 2000
50
and Spiderman
After that the Alliances between 101-2500 gets some mix of Iso and Hero Coins
If you end up in the top 500 of say 50000 (Our Alliance was last time) you are in the top 1% of all winning teams, and all you score is a little more Iso and Hero Coins? It just seems like there should be more. I like the way the Season Awards are laid out, at least there you get two Heroic Tokens.