How is this even post worthy material? Factions is out, test it before you post it.
Anyways, IW breaks combo-ing, Lead Attacks don't lead into Off-Hands, Black Lotus Strike didn't give me any energy back even though my target was hexed, etc. etc.
So you end up with an Assassin who can't use about 80% of his skills, and doesn't even have IAS (you could say that Double attack makes up for it, but don't believe it).
I would find it hard to believe theres a class that can use IW better than a primary Mesmer can....I'm going to try it anyway but I sure as hell won't be surprised when I fail
Primary Mesmer is the way to go on this Dagger/IW combo. You want to be able to use Illusion runes and masks because that stat will boost the damage whereas Dagger Mastery will not. Shadow and/or deadly arts may go well with a mesmer primary build because you can fast-cast the various associated spells.
If you're considering an A/Me, try a hex/ench removal/counterspells build which worked for those of us nutty enough to play a W/Me.