What makes a good blog ?

I’ve been wondering this for a while, because like most of you already knew blog itself is just a website but in this case it was personal website, but what makes a good blog ? is it because they are giving specific information from other source ? or is it because they are posting original content, how to guide, tips and tricks, etc ? I think the answer for that question may vary because everyone has different opinion about it.

But if it's for me, personally i only look at other blog because they’re giving valuable information especially if it's written by themself or based on their experience not just some copy paste trick. And of course this means i don't care even if it's a big website but only gives you a quoted information from / about other website launch, and such stuff (except for software site like softpedia for example) …