It's been 2 years and riot still hasn't done anything about Stopwatch
It's fine as a rune because people are actually sacrificing other potentially better runes for Stopwatch, but when I try to kill an adc, or support, or tank, or anyone for that matter it just ticks me off when they whip out the stopwatch and I'm sitting there thinking, "really?". It's way too gold efficient, and even though it's a 1 time use it eventually builds into an item with a similar effect like GA Gargoyles or Zhonyas.
And don't even try jumping to assumptions, I don't play Zed.