i rather like brawls hammer. the melee one sucked.
i rarely ever use the grounded version cuz of its short range, but in the air, i can dominate with it.
i am a kirby main, so i know when to use the hammer. i dont play competitively so nearly all my hammer options are valid. off stage, i use it apply pressure from recovering, i can combo it out of a grab, and the second swing of the hammer has horizontal knockback so it is very usefull for chasing people off the edge.
but i would like to see some change in ssb4. like in kirby's return to dreamland, he has a flaming hammer that swings up. i would like that to be his new grounded hammer that could set up combos by hitting opponents near vertically and is a potentil ko move. i would also like a dash hammer attack like the one he has in kirby's return to dreamland, or a smash hammer attack like samus has a smash missle. the regular grouned hammer could be copied over from brawl, while the smash hammer could be the flaming hammer with multiple hitboxes behind him like in kirby's return to dreamland, than swinging forward and upward with a single hitbox.
as for the dash attack, the brawl version was ok, it was useful for shield pressure sometimes, and had decent knockback. however, if they change it (which i think they wont cuz in the e3 video we saw kirby doing the head spin attack) i would like it to be the surf from kirby's return to dreamland.