A couple changes that could make Nem Draft a much more "enjoyable" game mode.
Nem draft suffers two extreme issues and can be fixed with simple changes to make the mode more enjoyable.
First issue is the repetitive picks. -Have Nem draft randomly pick a pool of 31-39 champs with the same bans still. Will open up more variety.
Second issue is the length of the games and pacing. -Increase starting gold. Maybe about 1.5k gold. -Increase the level you start out at. Maybe level 3 is a good spot. Increase gold/xp per minute. Something to increase the pace of the game.
These changes would fix a lot of the boring parts of the game mode. I really don't have any real numbers on what would be best but I do think that these are the two core issues preventing it from being enjoyable.
And to be honest if there was a way to combine this and urf it would be even more fun.