Assassin:

Multiple leads, then plus the offhand and dual, means less room on the bar for other stuff... well, and then we're back to the 'what is the role of the class' question again. :/

Rits:

Eh, I guess my preference is just the other way around. I mean, death blossom is one of the highest damage, armor ignoring, direct damage skills. Aside from that, vs a nest of lvl 20+ / AL 80+ spirits - Ele damage is reduced, as are most physical AoEs like axe, barrage, splinter.

Dervish:

Maybe I was unclear... I meant in my first comment that they should not buff the scythe attacks because it benefits non-dervs more than dervs.

IMO, scythe attacks should be more focused on secondary effects (+hp, +e, conditions, strip enchant, whatever) and the +damage should come from mysticism enchants. That way secondary dervishes just make do with the default damage of the scythe (which is pretty buff by itself) but primary dervs still should do more damage due to self buffs.

Mesmers:

Mistrust needs to have recharge 10 to become the anti-caster equivalent to Wandering Eye. Similarly, there should be domination equivalents to Clumsiness and Ineptitude. CoF comes close to the former if it was made into an AoE hex that interrupts the next cast and deals damage. Ineptitude needs a domination equivalent that will interrupt the next cast and cause daze.

(Of course, if they buff rit spirits as you like them, then it'd be only fair to buff spiritual pain back to its former glory...)