My ideas for fixing BLM.
Make manawall affect the whole group for 15% instead of the BLM for 30.
Leylines gives the group a 10-15% haste for 10 Seconds on activation.
That would give them one utility CD and one group DPS boost that would synergize perfectly with trick attack, litany and chain strategen.
This would make them a asset to any group combination.
I just don't see how SE can think SAM BLM and DRK are fine bringing nothing to the group.
Bringing this classes literally hurts your group.