Is Clarisse worth investing in?

In the most objective way under "someone else can do it better", no. In my case, I simply like her and can actually see her offense isn't that bad when compared to ther archers. Her Spd is tied highest after Setsuna/Gaius and Cordelia, and her Atk isn't that bad.

Clarisse is a pretty great unit. : P if you have a bunch of feathers and heroes lying around, you can try this build:\

Firesweep Bow+, Life and Death 3, Posion Strike, Threaten Def (or Spd)

For her special, go with Draconic Aura (at full charge Clarisse can kill alot of the faster units anyways)

Life and Death lands her at 39 speed, and with threaten speed, she can double most of the faster units in the game. Firesweep Bow will let her poke at units like Hector and Black Knight Swithout getting absolutely destroyed by distant counter, and because it's firesweep bow, desperation is complete waste of a Shanna (or a 5* Mae or something, if you have half a brain.) Poison Strike's gonna put an extra dent in their HP as well, so yah. S

I don't like the fact they tried to build a quad striking Brave bow build with her, 34 speed is fine but not high enough to make quad striking effective. I personally like her default bow and turned her into a ranged debuffer.

This build is insanely expensive, but if you like her...

Default Bow
A. Close Counter
B. Windsweep
C. Savage Blow
Phantom Speed