I liked the last comparison a lot better for severl reasons:
1. This power is just kinda boring. Sure it deals more damage than an average power but just a numerical bonus is kinda boring.
2. I think for strikers (especially) it makes more sense to look at (highly) optimized builds. And compare the attack to a baseline at will power. What I mean is the following:
A highly optimized Scoundrel Rogue will most likely have +4 to dex and +4 to Str (starting with 2 16s each and adding +2 to both from racial).
So a rogue would deal with this power 2d6 + strength = 11 from sneak attack.
And now the weapon attack would deal another 2d6 with a short sword + 4 dex + 4 Str = 15 damage
So in total 26 damage. This sounds like a lot, but a basic attack with advantage would only deal 7.5 damage less so still 18.5 damage.
However, and here comes the good part of this power: A level 1 artillery monsters (or lurker) only has in average 22 health. So the difference between 18.5 damage and 26 damage is the difference between needing 2 attacks, or only a single one.
If you would now upgrade the weapon to a Rapier (at the cost of a feat), the damage would even be 28 in average. This is enough to kill a level 1 controller normally.
I still think that other level 1 rogue encounter attacks like Dazing Strike or Positioning strike would be more interesting in general to highlight, but they only deal 1d + dex damage (which you could mention here), so they could not one hit kill such an enemy.
I just mention this here because often "just a bit more damage" might sound not exciting, however, this more damage can mean needing 1 attack less, which makes a huge difference in fights.
For the scenario for this power, as an example, you could have a rogue winning initiative and then go and kill an artillerie mob with a single attack, since the rogue would have combat advantage thanks to the "first strike" class feature.
I liked the last comparison a lot better for severl reasons:
1. This power is just kinda boring. Sure it deals more damage than an average power but just a numerical bonus is kinda boring.
2. I think for strikers (especially) it makes more sense to look at (highly) optimized builds. And compare the attack to a baseline at will power. What I mean is the following:
A highly optimized Scoundrel Rogue will most likely have +4 to dex and +4 to Str (starting with 2 16s each and adding +2 to both from racial).
So a rogue would deal with this power 2d6 + strength = 11 from sneak attack.
And now the weapon attack would deal another 2d6 with a short sword + 4 dex + 4 Str = 15 damage
So in total 26 damage. This sounds like a lot, but a basic attack with advantage would only deal 7.5 damage less so still 18.5 damage.
However, and here comes the good part of this power: A level 1 artillery monsters (or lurker) only has in average 22 health. So the difference between 18.5 damage and 26 damage is the difference between needing 2 attacks, or only a single one.
If you would now upgrade the weapon to a Rapier (at the cost of a feat), the damage would even be 28 in average. This is enough to kill a level 1 controller normally.
I still think that other level 1 rogue encounter attacks like Dazing Strike or Positioning strike would be more interesting in general to highlight, but they only deal 1d + dex damage (which you could mention here), so they could not one hit kill such an enemy.
I just mention this here because often "just a bit more damage" might sound not exciting, however, this more damage can mean needing 1 attack less, which makes a huge difference in fights.
For the scenario for this power, as an example, you could have a rogue winning initiative and then go and kill an artillerie mob with a single attack, since the rogue would have combat advantage thanks to the "first strike" class feature.