I'd really like to think that the bard will be pretty necessary, rather than just nice to have, in a party.
Bard, being a sort of jack of all trades support, at this point seems more nice to have though...
One thing that, IMO, would change that, is if the bard had stronger Mana regen abilities. For example
if there was a Mana oriented Cathartic Melody.
I'm seeing a lot of OOM going on in the previews (especially Steven

), so I'm thinking It sure would
be great if a party member could really boost Mana rather that just a small mana tick...