Do you think John Gardner’s perspective on Beowulf makes Grendel seem more sympathetic or more monstrous?

Yes, it makes him seem more sympathetic.

Explanation:

The perspective John Gardner used to describe Grendel made readers see Grendel as someone with feelings, much like every other human.

Contrary to what people originally thought of Grendel, Gardner shows him in a different light because we discover that he is not the blood thirsty monster we think he is, but he is empathetic to humans.

According to this perspective, Grendel's character was developed to show that he was lonely sometimes, even sad, and occasionally angry and even thought the humans were the monsters who he had to defend himself against.

you have to tell us what you're talking about or it's impossible to answer.