Nexus Blitz is Great except a few minor things
I think the gamemode overall is a lot of fun and I really like being able to surrender very early if everyone really isn't having fun. However, there are a few things I'd like to point out. There are a few champions who really are extremely abusable in this gamemode. Varus Xerath Karthus Sona Brand and a number of more. I think auto banning a few champions like you did in URF would be fair not only to gameplay but to allow for a stronger diversity in the what is considered "playable" champion pool. I also think adding a small amount of bans would be nice. Some games I'm just not in the mood to fight a gangplank or a Kled I think adding bans is another good way to allow players more options of who it is reasonable to play. Overall the gamemode is a lot of fun but there are issues with certain champions just being way too strong. Due to game time it really isn't that frustrating but I hope its still something that Riot picks up on.