I'm itching for more Saitama and feel trolled by the fact that the tournament isn't progressing faster than it is, but that's kinda the joke and I'm okay with that.

The whole monster thing is interesting in that they obviously have a greater goal, with each individual monster seemingly aspiring and caring about progressing through their "ranks" / threat level. It ties into the whole point of Garo believing that monsters are sentient beings worth empathising with.