However, it doesn't imply his/her main argument: Mordekaiser isn't garbage.
By saying "Morde is garbage at pro", you do not deny that "Morde is garbage at any tier".
Simplicity sure is nice, but a complete argument with very few questionable implications is much better than a simple argument that may not actually represent your perspective.
One last thing: his/her sentence is very easy to understand and follow.
I don't know why people hate negative sentences when it is clearly stated that they are in opposition to something mentined before "Second part? It's wrong." The only possible reasons would be lack of interest (which means that people don't want to discuss about it) or concentration (a weak reason in my opinion).