BLM is amazing for speedruns, but running coil you don't tend to do huge AOE.

Don't even get me started on eating dirt as a BLM in pvp, I already posted about that in PvP forums.
Tip for PVP: Use anything but BLM in pvp.
Every class is pretty much the same as they usually play in PvE compared to PvP except BLM whos job is to Sleep, Scathe, and eat dirt.
I will say MRD is pretty nuts in PvP.