Yup that's my opinion on adsense link unit.
You know why I hate link unit's even these are the most clickable ads in the program.
First of all, I had install link unit onto my website and ends up as a search box for ads. That so, not.
When I used the ads configuration on the blogger old platform it's works fine but on the new blogger it shows as a search box. I'm not sure why. But I had test and test few times and it happens on the new blogger either I used 468x15 or 768x15 format. it's always the same.
But on other site's I can see they are using multiple Link Unit on the same page. This is so... not good as the TOC says that 1 Link Unit.