Same here. Though I think I should mention that, initially, my feelings for the Shadow were pretty much the same. I thought there was way too much risk involved with Shadow Strike before I learned how to pick my targets more carefully and use it to escape, and didn't think much of Electric Slash. It's melee damage output was the only thing I was impressed by.
Opinion's pretty much done a 180̊̊° since. >_>
[EDIT] - Speaking of the Shadow, I really want to get it equipped with an Eagle. I really like using the Hurricane with it, but I lose out on that Melee Stunner mod... So, I figured the Eagle would be a nice compromise. But, I'd like to know what the cooldown % would be like with it's class tree focused on power/weight up to Evo#5. I'm sure I can get it at 200% regardless with the Ultralight Materials mod, but I'd rather use the Piercing or High-Caliber Barrel mods in it's place.
It's not like I do badly with the Slayer or anything, it just always feels as if he's lacking something when I'm charging into a group of Trooper-class enemies. For a guy with a sword, it doesn't feel like hiss melee puts 'em down fast enough—even with the Hydraulic Joints V Gear or Strength Enhancer consumables ... Maybe picking Radius over Damage for hiss Charge Evo#4 would help.
Always loved the Biotic Slash though! I either put 6 points on Phase Disruptor, or ignore it entirely these days.