I sincerely feel really uncomfortable with this new smart cast system because I think that many players uses to press a skill not just once but several times (don't tell me you've never done that).
The main problem here is that combos like the Zed one (where i usually use: W -> Q -> E) becomes a true hell, because each time I press a skill, it gains a different range, so if I keep moving while I want to cast, the system will stop the normal casting and make it gain the new range but this occurs over and over unless I stop moving.
I found it really frustrating on champs like Katarina, Zed, Akali etc.. where if you fail a combo in the middle of a fight, you got nothing more to do.
Again, this thread was made IN MY HOPINION.
Let me know what you think about it.