I think after one attempt its pretty harsh to judge anyone on their DPS, there is usually a number of reasons why things go wrong but ultimately it boils down to people looking for someone to blame for the faliure and usually it's not just one person -

Especially Thornmarch ... I assume the OP went as DRG if so chasing after those crazy little moogles as meele DPS can be tricky, you can't just attack any moogle its has to be in a specific order totally mess up even the most experienced DRG rotations especially when they dont stand still. If all other DPS in the party happened to be ranged (i'm speculating) then there would be a noteable difference in DPS because that fight is so much easier for ranged classes.