I also prefer to play on random seeds. And, yes, the luck requirement is a tad ridicules.
It does take a while to clear individual levels. I didn't play it all at once (I had other things going on) so i don't know how repetitive it really was, but I did spend a lot of time bypassing enemies while I explored.
Waiting can be annoying, but I would always have spent time tracking and hunting my enemies while it charged. It was also great that it would charge as I moved around the levels, and when its a extra large I had plenty of time between assassinations.
I also very commonly use the Assassin in my runs, so I AM very used to the wait time. So, in general, I didn't suffer from the wait or repetitiveness but others definitely might.
Oh! I didn't catch that. Thanks for the clarification.