List of suggestions

1. Make some percentage of heals permanent - ie heal for 1000 let me keep 500 after the match is over
2. Allow substitutions of different tier characters for required characters - ie 2* Ms Marvel required, allow use of 3* Ms Marvel, just don't give lvl boost
3. Give an end of PvP event ISO bonus for total points earned - ie you actually accrued 1350 points but finished at 450 due to losses while not shielded. Give award based on that 1350 #.
4. While we'really on the subject how about diminishing losses in PvP when not answered - ie fighting for that next tier (650, 800, 1000) you win your match and gain the 25 points it was worth but during that same match got attacked and beat 5x. End result negative 150 points. How about instead first loss 100% of points taken 2nd loss 25% 3rd 12.5% etc. Reset after each win. Last two suggestions would certainly help with how frustrating PvP can feel.
5. Fix the daily resupply... awards should increase with time.