Soo far i noticed players playing only full assasin or glacial every single game. That's just not fun, doing same thing over and over, noone tries out some new stupid stuff, by all means these 2 classes should be changed.
Now when i say changed i don't mean nerfed, but literally changed.
Like glacials instead of stun, could have attack speed reduction, depending on class level.
Assasins could like have the stuff that yordles have(dodging attacks), armor penetration, electrocute effect etc...
This are just some of the ideas, let me know what you think about this, or even better submit some your ideas!