Yeah, you are right. Still I think it could either use a stronger slow because I'm expecting people will just pair it with a secondary that also has slow as well to help with all patches the set is doing, or maybe adding -recharge would make it more useful in a team environment rather than just being another proc nuke.
Pulsing sleep was great for solo. but with that being removed, adding any other debuff effect would make it a more interesting power. I don't want Sleep Grenade to just be a proc bomb option.
When it comes to Gun Drone, while more damage is nice, It's a very boring pet even if it taunts. Maybe giving it something like Seeker Drones could be nice?