like when a nid main is under tower and gets like 6 cs at awkward health despite tower attacks with each CS taken in a different way.
some champs (irelia) have it a lot easier than others (swain) but the people that are mechanically strong with their champs will know the little tricks on how to squeeze out the last bit of gold from all cs available. --- ~GameFAQs LoL Board President~ http://i.imgur.com/6rO0g.png
Anivia and Karthus don't really even last hit; they just turn on their AoE's and destroy all the creeps. --- Generation 30: The first time you see this, copy it into your own signature (on any forum) and add one to the generation number. Social experiment.
I'd say you can tell how good they are by how they use their skills, each champ is variable with ease of farming, someone like morde makes for easy easy farming, but not every champ has an entire kit of AOE skills
creative and clever use of their skills is the best way to gauge skill, examples:
a good Jax Q's to his minions to escape from an opponent, and puts down then Q's to wards to escape, or hop over walls and stuff
a good teemo has every bush on the map have atleast 3 shrooms and runs away from enemies in a way that leads them into as many shrooms as possible(presumably he put them in a line down the lane)
a good nunu will prevent enemies from chasing, or escaping by ulting in their path, or force them to back off of him or risk his ult killing them before they kill him
a good anivia would wall her opponents in such a way that their only choice is to try to escape you into a gank by your jungler and get killed
a good rumble would either ult like nunu up there, or anivia up there
aaand a good anyone with skill shots(ezreal, ashe, draven, etc.) will do unebelievably amazing things, like getting a kill in top from bot --- League of Legends IGN: devilkingx - add me and play with me Official Raichu of the pokemon X and Y boards