Typical. Could be a hair smaller but I do not think there should be any complaints with 1/4" on each side. No filler that I have ever seen. You need some space to get the stove in and out without risking damage to the top or the stove.

Some people buy a T shaped metal piece to cover the gap day to day to stop spills from going down the sides. I don't know if this looks better, but it does help with spills, allegedly

I ended up ordering the gap filler that goes with my stove but it still annoys me that the gap is so large and the cut even seems a little “wobbly” when sitting at the island you can see the light through the gap.

Pic of gap from the back

That would bother me also, but with a range you're going to have a gap. It does look like it's off kilter. Next kitchen do a cooktop.

Buy the t-shaped trim. You don't want ick going down that gap.

@hu-227031627 that’s what I ended up doing, I don’t think I have the energy to try to have them replace the entire island.