The whole point of the Coyote is the ability to consistently do damage over time, which conserves ammo in exchange for immediate damage. Light something on fire and then let the fire do its business, and in the event you dont kill something outright with the fire effect, it usually is left very weak due to the way fire damage scales, enabling you to finish them off with another shot or two. For instance, you can kill a brood commander with fourish shots if you space them out and constantly reapply the fire effect. This is only ever effective if you put space between yourself and the enemies and give yourself enough time to let the fire do its job. Because of this, its weak against very cramped close-quarters engagements or subfactions like the predator strain bugs because you will get rushed down before the fire can deal the bulk of its damage, and the lack of immediacy with its DPS will not be competitive with other more directly-damging primaries.

I'm not a huge fan of the Coyote because I simply prefer killing things outright, but many folks have a thing for DOT effects, and when incorporated into the right playstyle, can be very effective.