I find Daruis annoying. Think about,
Passive- Posion. Both teemo and twitch are built around this gimmick, and he has it and other annoying things?
Q- Punishes you from running, who thought that was a good idea?
The slow- So your giving armor pen to the guy that does ap, ad, and true damage?
The pull- so blitz's pull without the skill and can pull more people?
The ult- Need I get started?
He is a poorly built champion that is underpowered in lower-level play, annoying in middle-level play, and non-existant in pro-level as far as I know.
And to Certified, If is used properly, it shouldn't go on cooldown.