Rogues do need some buff. Real time statistic show how hard the life of being a rogue.

The data above shows that rogue's life is significantly harder then other starter classes.
Why rogue's life is so hard?
1. Stealth is not reliable, due its mechanism, monsterd will always have a chance discover you when you are doing melee attack. And even the monsters haven't see you, the random attacks are still dangerous. You better don't rely stealth for fleing, it is only good for the first hit.
2. Poison and Bleed damage have alot reistance issue, especially those who occupied a major part of the top killer list -- Undeads.
3. Traps are hard to use. Traps probably are the best talents of rogues, but they are not stright forward. They need high level tactical capability. Another important issue is that traps are conflict with Posion and Dual Wield trees, because traps require you set up trap and step back while melee attack require you approach target.
Why Slings is good?
1. Perfect stat fitness. Slings require dex and cun, and dex and cun are Rogues' main stat.
2. Perfect cooperation with Stealth and Traps. Stay away from enemy will make Stealth more reliable, at least it is easier for you to restealth. Traps with ranged attack are just perfect conbination, set up trap, shot, and flee away.
3. Game need more sling users. Archers are currently the only class who use sling while half of them actually go use Bows. So we need more Sling users.
4. Game already have a slinger rogue. The whateverhisnameis halfling skeleton rogue in the Dreadfall. So let us players can do that too.
Further buff
1. Make poison works with ranged weapons. Poisoned arrow/ammo is not counterintuitive.