First I want to say. I Love The New Sounds Idea! I had the same idea just days ago and wondered if it would be possible. Surprise! Wish granted!
Very early after I started playing and unlocking skills. I felt something was missing. I found it very unsatisfying to kick something only to have it say I used kick in chat. I have now leveled to a Master Ninja. With sound many skills have come alive making the experience more fun! Eviscerate sounded a bit odd early on but I see its changed now and a lot less strange. Blitz Is Great! Flash! Bang! THUNDER! from a lightning attack is such fun! However on a whole I think a ninja should be "Stealthy!". The cat sound was very bad for sneaking around but it seems gone now. That's good! Unfortunately the sound for Smoke sounds like TNT going off! BOOM! That's not so ninja like. I think I understand the idea behind the sound. You wanted the ninja to seem like he is throwing down a smoke bomb maybe? In my opinion, (and it is just that) smoke bombs are not so noisy. Perhaps you could use the "FIZZ" sound for smoke?
- Too loud
- Wrong type - Substitute EXPLOSION with FIZZ or perhaps even nothing.
Ninja = Quick, Silent, Deadly, and Gone!
Ninjas are not - Crash, Boom, and Brawl!
Just my thoughts. I also wish I could try/hear all the other classes now first hand.