I just installed a solid wood door (first time doing it) and I got a gap of 3-4 mm on the hinge side and 6 mm on the striker plate side.
Just looking at it I think the gap is a bit too much, but I might be overthinking it. I even surface mounted the striker plate (instead of inset in a mortise) just to reduce the gap a bit.
The hinges are properly inset but I think that I can shim between the hinges and the door jamb with some cardboard shims.