Quintus isn’t great, but he also can be useful when used competently.
If you have a better sorcerer, don’t use Quintus. Sabina is a good choice that many players have early, but in all honesty a Sabina +20 might be better than Rigard +0 in a lot of situations, she is very rarely better than a costumed Rigard. This means that with the exception of wars, trials, and events, she will in short time warm most or all benches. Of the other TC20 choices there is Skittleskull who is at best a limited use 4*.
So from the pure Vanilla, no HOTM, no S1/S2/event Sorcerers, Quintus is a good choice as his tile damage will be superior to most other Purple options, very much so if you can obtain a costume. He isn’t the best choice, but outside of War Defense, he might tie other options. From a Titan standpoint he’s solid and his tile damage with costume bonus even Anchor has noticed, Costumed Quintus being A+ on titans.
Raiding with Quintus:
2.5 years into the game and I can say my second string mono teams (thanks Telly) are all pretty meh. There’s a good one in each color, but usually one color (99% of the time blue) doesn’t get used. Quintus is a really good /2 purple with Wu or Ranvir in the mix. About 50% of wars I run a team like this
I don’t care if Wu is up when I fire Quintus, that’s usually a good thing. It’s a higher risk strategy but it does reward as well. The tougher the heroes, the better. This is my YOLO strategy, and its far from a guaranteed win, but it leaves better building blocks for my other teams. Teams that tend to oneshot more often than fail.
You don’t say, “wow Quintus won that match” because he’s not a game changer. He’s a bit more like an unsung hero, bolstering a 3/2 attack rating to cover for a weaker hero while simultaneously not being a paper tiger. Quintus is never the key hero, and he should never be, but he also avoids being a weak link. Quintus is solid.
In summary some heroes you ascend as soon as you can. Some heroes you decide are better than others, so you have to wait on more mats. Quintus doesn’t win most head to heads in the Tabard competition, but he’s still a hero that, if and when possible, should be ascended.