I feel like Lulu was healthier before her 'e' got changed...

Before you downvote this please read everything. Lulu used to be an average support. She had decent damage and AP scaling but nothing spectacular. She was picked frequently in LCS, but as the game has evolved so have other popular supports (Zyra, Malzahar, Blitzcrank, Thresh, etc). Recently, she got a change to her 'e' (or her 'w', I can't remember) that grants attack speed. Twitch and Kog'maw now have a 55% win rate (both adc's that synergize well with attack speed), and I am 100% certain Lulu is responsible for this (the data on champion.gg also supports this). It's possible that maybe Kog and Twitch are a bit broken, but no one can deny that Lulu is at least partially responsible for their success. We had similar problems back when Nunu support was a thing (blood boil attack speed), but that power has now shifted over to Lulu. The attack speed alone isn't a problem, but when you combine it with her shield and her ult, you have a machine gun adc that becomes almost impossible to kill.

http://champion.gg/statistics/#?sortBy=general.winPercent&order=descend