So, he can set traps instantly in the middle of battle, he can set them directly on a living target, he can create them in mid-air...
...WHY do people in this world consider this a bad class?
And why has he never practiced using it offensively?
Just put the Slash Trap directly on the target, or use it as a Counter-Shield!
This really feels like the author just wanted to give him an OP Class, and still have it called useless to make him feel like an underdog and justify getting him kicked out for being weak.
This makes no sense at all, him being weak is just a damn big Skill Issue, he had no need of an Unique Skill to shred through enemies with how this Class works.