I dislike the gimmicks too. Rek'sai and Skarner now both have a "Stand-On" gimmick, a totally boring and slow gimmick where, instead of attacking (like clearing a ward or a Teemo shroom) you just stand around like a dolt on a point for awhile until something changes. I hate the gimmick and wish it would go away to something that feels more active and less like leaving you a sitting duck.
Fiora is so annoying the play against now. She dashes all over the damn place and when you see her annoying passive pop up on you you just know your about to get chunked. Her dmg is so high, shes got some mobility and she can make herself immune to CC. Her kit went from being meh to over-loaded and numbers over-tuned. Oh, and if she taps someone and her team kills that person they get an insane Janna heal. I miss the old Fiora ult so much.
I don't mind Garens villain system. As someone who plays a lot of top I sometimes lose games where I'm doing well but the mid or adc are fed out of their mind and nothing can be done. Garen's villain system lets me shut down that fed enemy. My main qualm with Garen is they took a champion that had an incredibly strong laning phase and gave him serious late-game damage. So you win your lane by showing up as Garen and then you have an enormous impact in late game due to your high probability to kill the opposing teams most ahead player. 5.16 has been a terrible patch. I never thought I would but I'm looking at HotS and DotA more and more.