The amount of random suggestions that have absolutely no sense in this thread is very worrying...

SMN is perfectly fine. It could use a slight potency in some of its spells because of how punishing and complex it can get to do good damage with this class (as opposed to BLM and RDM which are more braindead, especially the latter).

Only issues I can agree with atm:

1 - Bahamut size. Just shrink it.
2 - Make the pet even more sturdy against AOEs and random mechanics.