I kinda miss some of the old meta. They were stupid and absolutely ridiculous now but they were fun till they last. It's more of nostalgia than actual good gameplay mechanics.
The memeing strike meta, afk zenistar, wukong nuke, trinity self damage nuke, old banshee resonating quake, cutscene ash's ult. So on and so on, there are many OP abilities and mechanics that people either loved or hated to death.
Also I definitely miss 8 player raid and old corpus ship tileset.