There has been STACKS of discussion of what makes a blog a 'quality' blog. I -think- Matt started it, although Lass may have posted almost simultaneously, and the topic has grown from that point. It is great to see the level of discussion and analysis about the art of blogging across the WoW Blogosphere, but I think that something important needs to be addressed which I have heard from a number of people.
Something which concerns me both as a writer and as a member of the BlogAzeroth community is the level of 'intimidation' (for lack of a better word) that people, especially new bloggers, sometimes feel when they are inundated with 'how to blog' posts. Please, PLEASE keep in mind that these posts are only ever intended by all concerned to be a guide (or advice), and quite often it is a guide to writing a specific sort of blog. If you are wondering what sort of blog these bloggers are giving advice about, have a quick browse of their blog - people typically recommend their own approach!
Please, also remember that none of this is meant to be threatening or scary. Don't feel like you have to go and change your blogging practice entirely based upon the advice of a blogger, no matter how well known or successful they may be. Take the advice you like, and weave it in to your own style. If you find a particular piece of advice difficult to reconcile with your own ideas or philosophy, don't be afraid to say 'I can see the value in that, but it just won't work for me'
Above all, remember that blogging is like any craft. You can't expect to be fantastic at it immediately, and you will continually develop and learn as you write. I don't think any blogger has stopped learning and improving their writing - that's half the fun!
Posts so far which address this - please feel free to add as you find them
The Purple Kodo: World of Matticus10 Reasons Why Your WoW Blog is Boring - Lass's Priest Blog (Antherwina's Corner)Open Letter: Destructive ReachLeafy's Blogging Bootcamp: LeafshineThe WoW Blogging Dichotomy: Tank Like A GirlThoughts on Guides: Rez the Weak