If you play rogue you will also need Polymorph for skills like Chameleon cloak. Spread your wings is probably nice to for more mobility.
Early one though playing backstabbing rogue will be probably pretty suicidal, probably should bow or crossbow at first, depending on difficulty.
Though not sure if scoundrel is such a damage machine, we used our rogue mainly as a jack of all trades. Archer out damage him by far, so most times he made early damage burst and went invis and later on helped keeping enemies down by applying knock down and finish them off too by backstabbing them.
I loved to play Scoundrel-Aerothurg in the first, but that got sadly totally ruined.
Very late to this thread, but all I can say is that I guess it matters what character you're using for your Rogue. My Fane Rogue was ridiculous, and early on it wasn't suicidal at all. Not only did he not have any mobility issues (with just Backlash, but there was also Cloak and Dagger and Adrenaline for early one-shots), but he could also "Fane Death" and not have to worry much at all about retaliation.
Other than that, it's sad to hear that Archers haven't changed much since I last played in November. They were easily the most dominant source of damage by far, and the game was already heavily skewed in favor of physical skills anyway.
