Ok, so I gave it a shot, and popped Slasher on test center for a few minutes. I was doing ok damage, but it was less than my usual run. Not by much though. With the disco in effect however I wasn't missing him at all, so each hit counted for something. I do miss bushido, I'm a big fan of the confidence heals that can help out in an emergency. Easy enough to fix with heal potions. I actually think I'm going to give this template a run on my production shard. Although the benefit of bringing another bard along far outweighs this templates solo capabilities. I do think that this will be my new slasher template. As far as other things, time will tell.
Consider me converted, at least for the time being. I always like to try new things out.
UPDATE: This guy works well against Navrey, I needed to finish up a little bit of tactics, and this guy works awesome vs. the big spider. Disco him, drop some rocks, change into wraith or stay in flight and toggle between armor ignore and hitting him regularly, pluck at him(never miss since he's disco'd) then drop rocks when pedestals respawn, and he's dead.
Template I went with:
120 Throwing
120 Music
120 Disco
100 Anatomy
100 Tactics
80 Chivalry
40 Spirit speak
40 Necromancy
No skills on jewels.