@TheF34RChannel - if you DO pick Moze be wary of going into her Orange/Blue skill tree early on. Her Iron Bear action skill (the giant mech suit) has the longest CD in the game (blue skill tree mitigates this tremendously). Her gun damage (which works WITH the mini gun) from green skill tree is superb damage.
FLAK is great with his Orange tree - his raks literally 3 shot the group of BAs my brother and I fought. I respecced from Blue tree into Green (lvl 35 mind you) and my damage has gone up tremendously, but Iron Bears CD has also gone back up to a long CD again.
Devs know about this and will be making her CD shorter by default like everyone else, so that isn't something to worry about.
Zane is quite fun if you enjoy a helpful clone and the ability to teleport to it can get you out of some sticky situations imo.
Amara - siren...what else can you say. Still has a gravity grip like Maya from BL2 so awesomesauce there!
Hope this helps you all out