I think Demigod would profit from encouraging team play more. Citadel upgrades, capping flags, healing/shielding team members should be worth the time, mana, cooldowns and health invested into them. A good and easy way to implement this would be to add a few new achievements.
- first citadel upgrade
- 5 or more citadell upgrades
- defender (kill creeps/demigods close to a structure under attack)
- healer (highest number shield/healing used on other team members; maybe not in Pantheon)
- life saver (healing/shielding a team mate with health < 50%; maybe not in Pantheon)
- flag locker (only flags in the middle or enemy base count to prevent exploiting)
more to come...