Katanas are way too fast, I completely agree. It takes half the time to kill someone than a fast gun (Example: Black Lotus

). It's unfair, especailly since I've run into "Magic circles" that were invisible and stunned/killed me numerous times. Katanas should be removed altogether, in my opinion.
Also, that stunning effect means easier laming. That stun effect should be removed. If that would be removed, katanas wouldn't be AS bad as they currently are.