Was it utterly boring? Did you mind at all that every area was basically a rinse+recolor+repeat of every other?
Well, it certainly wasn't exciting! For some reason, it didn't bother me as much as it should have. I guess I was just preoccupied perfecting my weird sphere grid plans to care too much about monster diversity. After all, recycling did help to keep the balance of usefulness between the character types in check (ie black magic, speed, tanking were never utterly useless for long periods of time).