Electrocute doesn't work. Three champions are turned off for gamebreaking bugs. Death recap is broken. People can't reconnect. Bug splats everywhere. Many champions with channeled abilities (I was playing Vel'Koz) are unable to cast said channel for no reason during parts of the game.
And that's not including the "intended" features of the patch. Why the fuck does mousing over someone on the minimap display their name in a way that takes up the whole lower corner of your screen?
Big yikes, Riot.