I find raids frustrating too. It lessens (a bit) with a better team, until you come up against the 5* opponents.
It may reduce frustration a bit knowing some of the mechanics:
- The opponents do not play on the same basis as you do. They have an algorithm (with some randomness thrown in) to determine their hit rate. Sometimes you are unlucky to face an opponent that has a high hit rate.
- The act of you hitting them fills them with mana. You need to plan around this with some of the strategies below…
Some strategies:
- Avoid too many horizontal tile attacks as you then fill multiple opponents’ mana.
- Try avoid filling mana of the more dangerous heroes in the opponents team (within your ability to do so given the tiles).
- When you have killed 1 or 2, it may be better to aim for the gaps to charge your mana without giving the opponent any.
- Focus on taking down individual members of the opponents team to open some of the gaps mentioned above.
Hell, it will still be frustrating, but knowing the mechanism may help.
(I am amazed that the player community seems to either like, or accept the frustration of raids. It’s bizarre.)