One thing I really don't like is going to a blog and having to sit there figuring out where everything is.
I don't care where it is, if I go to McDonalds I know I can order the exact same thing as I could at a McDonalds 1,000 miles away. I know what I can expect.
So often I see blogs that make it difficult for the reader to navigate. That's a mistake. Make it easy for us, please! I don't need a huge jumble of different things, I just want to see a bit of a blurb about a post and a link to click on to read the entire post. Please don't make me have to think! I see so many blogs that are so crowded with different stuff there's barely any open space!
And if you are going to put a teaser blog post headline up there, don't mislead me. Make sure the headline is true to the blog post. A headline like this: Angelina Jolie Caught With Drugs! should not link to a post about how someone spotted her buying a bottle of aspirin one night. That is completely misleading and I really hate people wasting my time. I will not return to your blog nor suggest it to anyone else. I'll more likely tell them to avoid your blog!
Colors and designs that are pleasing to the eye are nice. I don't need fancy graphics or animations. That stuff just interrupts my experience with your blog.
Most important, though, would be content. If I gain nothing from your content why would you expect I would return?
Take it for what it's worth.