That avoid monsters that are too hard thing bugged the crap out of me. Largely because the monsters in that area weren't hard, they just took longer to kill and it was tedious. I actually ended up avoiding most of them because of that, not because I couldn't kill them. They really should have saved that message for Gran Pulse where there are actually monsters that you can't kill when you get there just standing there in front of you begging to be attacked.