Regarding melee weapons needing a buff...I've found spears to be pretty amazing. Reach is already powerful just from the obvious extra hit while the enemy approaches, and it combos really well with lots of abilities. Anything that creates space between you and the enemy can give you a free attack every turn, and Alacrity from the Renegade Helm can do the same.
My only win is with the Monk amulet, so no disagreement there! I've tried to build around fighting multiple adjacent enemies with axe weapons, but I haven't made it work yet. I feel like good builds for that exist, and I just need to find them.
Hammers seem like they've got some tactical potential that I need to explore better. Swords and daggers, though, I'm having trouble coming up with ideas for good builds there.