Jungler: *fails a gank bot and gives enemy adc a kill*
"WTF THIS BOT LANE SUCKS!"
Honestly, half the time people blame bot lane for losing their games, they don't realize how they contributed to bot lane getting behind. Enemy top lane TPs, friendly top lane either doesn't match TP or doesn't keep pushing top for pressure. Enemy mid roams, friendly mid goes to base. Friendly jungler shows up and tower dives two full health opponents, enemy jungler goes in for later 2v3.
People REALLY need to consider how they play around bot lane. Ganks help, but you can't just gank at any random, bad time you feel like, the situation needs to permit it. And if your failed attempt to help the lane, warn them of incoming danger, or match the pressure applied to them elsewhere on the map only gets bot lane behind, that's YOUR fault and not bot's.
Half a rant for a game I just did, half a rant for almost every experience I have in bot lane. You can turn a winning bot lane into a losing one with a failed gank handing over a kill. That doesn't mean it's bot lane's fault you lost the game. Play around it and get them out of the rut or match the pressure elsewhere.