Wits with scoundrel are not useful. If you are going scoundrel, you should be backstabbing. Otherwise you just can't compete with other builds.
Summons can be among the hardest hitting damage options in the game. Particularly in early game, they can also be a very useful meat shield. I do however agree, if you aren't going to commit to them, you're better off without.
Poly is VERY useful for mobility. I agree don't go past a few points tops, but to say you should avoid it entirely for 2-3% more damage I believe is erroneous.
Where I absolutely agree with you though, is that you cannot do *all* of these things. You need to have one primary method of doing damage and pick mostly skills that multiply that. Otherwise you will be outclassed mid-late game.
I was not referring to the Rogue class in particular. Scoundrel is essential for all crit builds - including warrior and ranger - because of the crit damage multiplier it provides. I am even taking it on my mages right now because I am going down the crit route.
As for Poly, frankly, I have never tried it and I appreciate that it looks useful on paper, but I have practically never thought that I was lacking mobility because Warfare (Phoenix Attack, Blitz, Battering Ram), Scoundrel (extra move speed, Backlash, C&D) and Huntsman (Tactical Retreat and you are already ranged) skills already provide so much of it.
