What ryanthejuggler said is true (and mainly why even impressive ones aren't worth much), but mainly because game jam projects are usually unimpressive and made of gluing a bunch of things together.

Totally ignore is probably stronger than I mean, I take a look, but I don't think it's ever strongly effected my decision.

I also can't speak for the entire industry, this is just what I've seen where I've worked.

Considering "he lacked the attention span" in GolfyMcG's comment, it shows the dev can create, but doesn't demonstrate any long-term follow-through or team dynamics.