Ok, but the Honnecourt sketches are kind of strong. Not professional by today's standards, but decent. I'd be happy to have done them--but I'm not an artist. The tapestry can be appreciated, like Klimt's 2-D-ish stuff can be appreciated. The style is fine. It's not fantastic work, I wouldn't hang it up, but it's reasonably accomplished.

In general, though, yes, I think medieval European artists were short on skill compared to artists from Europe in pre-medieval and post-medieval times, and art from other places between ~500 and ~1300. They had some skill, but not as much.

Artists with limited technique are a real thing. Not everything is taste or style.