Even if you don’t use claw like the picture above!
If you do this button-mapping,
You can hold the pad comfortably and use the bayonet easily.
also can reduce frequent use of L3 Stick. The pads don’t break easily.
I wish this button remapping menu was also available on PS3… 
And about the melee-dodge, I think it breaks Helldivers, as the game is not supposed to be played like this (i.e. invincibility frames during melee-dodge). 
Too bad Arrrowhead never managed to fix this.
It’s not exactly an invincible frame, but if fix it, a lot of people will leave. It’s content.