Great review! This was a game I almost deleted after a few plays, but then I ended up playing for countless hours more, usually a few minutes at a time on the go. At first I thought there was little in the way of strategy, but then I found the right combinations of cards that worked for me with the various characters and I appreciated the innovative and sometimes wacky game design. To me, that learning curve was the best part of the game, and the repetitiveness you mention, especially in the early stages was the worst.
I would have almost certainly deleted it if I ran into those 20 second load times on an older device. Does anyone have a newer iPad for Tof?