The following are not friendly to your visitors:
A post with one long uninterrupted paragraph. It is difficult to read.
Embedded music/song - Some computers have problems with these sites or it may take a long time time to load the page. And remember the proverb: One man's like is another man's dislike. Embed the player too so that your visitor can stop the music if it wants to read your blog in quietness.
A page too clustered with things - badges, awards, advertisements, boxes and others. You may think it is impressive but others find it distracting and untidy.
Links - I think bloggers should check out the links in their lists once in a while. Dead or outdated links should be removed or updated.
These are just my own views.