Admittedly, I'm no game developer - and online games are never balanced or designed by exactly ONE person, but by several people giving their input. I'm still convinced that something similar to the following would prove to be more fun:
The first and most obvious thing is that the Mesmer-specific stat now reduces the CDs of clone-generating skills. (may as well allow it to affect utility skills? Hell if I know, I'm no master of balancing)
Staff's Phase Retreat - swapped with Cry of Frustration. Obviously, adjust the CDs of both accordingly for the sake of balance - I think Phase Retreat would be fine at either 10 or 15 seconds. Cry of Frustration would need to be reduced to 20 seconds or so (remember +30 in Illusions currently does this already)
Sword's Illusionary Leap - swap it with Mind Wrack. Mind Wrack could be fine at 12 seconds - Illusionary Leap could be reduced to, say, 8 seconds, as I'd expect it to be the primary clone-generating skill. On top of that, Swap should now be the F4 button. You Swap with a random clone, and cause enemies near your initial position to be Immobilize for a few seconds. I'd say 30 second CD. Distortion is addressed below.
Also to consider: Riposte should maybe do something else? See below for why. I'm thinking it should Daze the foe if you're attacked, but Cripple or Immob if you end it early.
Scepter - Chain attack obviously no longer generates clones. In some ways this hurts it, but that depends on how well or poorly the F1-F4 keys are balanced numerically. It should properly apply 2 stacks of Confusion instead (and thus, in a way, this change also benefits it). And now, Illusionary Counter and Diversion should be swapped (except that, obviously, Illusionary Counter is F3, not F4). Illusionary Counter should perhaps be made to block all attacks for the duration, and then create an illusion regardless of whether or not you're attacked. (it's either that, or keep it the same, imo) CDs adjusted accordingly.
Greatsword - Now, this is the only tricky one to change. Mirror Blade is great on it's own even without the clone generation - and you might want to use it WITHOUT shattering as well, so attaching the shatter to it is likely a bad idea. What if this is the ONLY weapon that doesn't have a shatter? The only alternative I can see to this would be to attach the shatter to Mind Stab, causing the illusions to, instead of shattering on a TARGET, to shatter specifically on where you cast the Mind Stab - the shattering illusions could cause Cripple, while the Mind Stab itself could continue to cause Vulnerability. They'd obviously need to, say, instantly teleport to the targeted area, or else rapidly move there, or else you'd never be able to hit with those shatters.