Are 3* worth anything besides arena grind?

MasterDoom said:

I have about four three stars, that are over 2,000, and more powerful than some of my 4*.
Is it worth putting them in WARS, or QUESTS? I don't think so, but curious what everyone thinks.

The short answer is you use the best you have, and depending on your progress level the best you have might be 3* champs. The different star tiers overlap in power in general, and then different champs have different strengths that can make them more useful in some situations even when you have champs with much higher PI rating.

For example, a maxed awakened 3* Scarlet Witch can be an extremely strong attacker, sometimes doing better than equal or sometimes superior rating 4* champs (sometimes even low ranked 5* champs). A 3* Domino or Mordo is probably going to be a harder defender to kill than a 4* Iron Man when placed on defense because those champs have special abilities that makes them harder to kill even when they might have less attack and health, whereas Iron Man has animations that are far easier to evade and doesn't have similar nasty defensive abilities.

Because different situations call for different kinds of abilities and champions have different strengths and weaknesses, part of getting better at this game is learning those and knowing when a 2000 rating 3* might be better than a 3000 rating 4*. In fact, you'll discover after a while that most people don't even talk about or refer to rating most of the time when talking about their own champs. They just mention the champion itself (Mordo, Ghost, Hyperion) and the star rating and rank, i.e. 5* rank 3, or 4/55 (which is implicitly a 5* champion because the highest you can level a rank 4 4* is a 4/40).

So I might say a 3* 4/40 Scarlet Witch (SW) is better on attack than a 4* 5/50 Iron Man in many situations, or a 3* 4/40 Mordo might be better on defense than a 4* 5/50 Karnak.