Grenade

So I went back to my old pirate (and looked at the guides for post-Big Bang gunslingers) and found that it's still classed as a useless skill. However, if I was to try practising aiming and managed to get a reasonable degree of accuracy off of it, would it still be that bad? It does 280% damage with 80% DOT for 8 seconds at max level to 6 monsters, that's a whopping load more than invisible shot's 3xx% to 3 monsters. I understand that it would still be slower to aim, but it looks loads more fun. Any input?