Back to late S5 before Juggernauts(and Fiora) happened.
A long laning phase allowing all kinds of Champions to be played. A JGL with mediocre impact allowing a coexistence between Farm(devourer) Tank(CInderhulk) and Gank Junglers. With slight disadvantage for gank jgls, those had to snowball.
Due to overall more HP and less DMG Teamfight where long and pretty intensive.
Assassins have been in an okish spot - strong laning, mostly demolished in Teamfights, but in Carry-Spot when playing good and getting ahead.
Basicly 'LC$ BIG PLAY$' were weak - team reliant stuff strong = perfect Meta.
If I think about what I could play back than on my way to Dia3....
Top Urgot and Galio... JGL Leona.... Mid Anivia, Swain, Veigar, Vel, Talon the chance meeting one champ twice in two games were non existant - people ASKED for Banns because you just had 1 or 2 important ones! (Cant remember who though.. Seju comes to my mind.. but after the first Cinderhulk nerf she was manageable)