Nexus blitz is fun, but it's also everything wrong with league, only bigger, better, and faster.
I understand "its for fun" but if thats so, why make these modes SO TEAM RELIANT? Because lets be honest, in these modes teamwork is the LAST thing that is being pushed.
One shot kills, high afk rates, lack of team composition, nobody knowing what anyone else is doing, low return value on champs that dont offer instant kill potential, massive snowball wins, overpowered setups, champs, and items, etc etc.
I always get drawn to these game modes, but after a few plays it always ends the same: Summoners rift trollness on steroids.
Honestly, the only saving grace is knowing that the game will end fast, and the placebo effect that "its just for fun", besides that when really observed, the game mode is another shitshow coinflip at best.