I agree that they could’ve been more varied, but I have no problems hearing their dialogue - I rather enjoy it too. (Perhaps tweak your sound settings?) I can’t help but chuckle every time I hear one of them say: “Let’s swap recipes!” or “There goes the diet!” or “I’ll wear your ass as a hat!” …the list goes on.
On a side note, I’m really surprised at how many people dislike the accents in this game. Admittedly, I hated Pickle’s at first; but it grew on me later on and I came to really like the variety of accents represented throughout the game. In fact, after hearing Pickle’s ECHO logs in the Motherlessboard (how appropriate), I felt pretty sad and regretful of how much I initially hated him.