[kineticflow]

>Does it have bookmark/password syncing?

Yes.

>Does it have in browser spell-checking?

Yes.

>Large library of secure addons?

No.

>Built in PDF viewer?

No. (Although, Windows 8 does have a reader app)

>Quick close-able tabs (like Chrome's realigning close buttons?)

Yes.

It sounds like you've never used IE10?

[JohnsonB]

I only checked the new features list compared to IE9 so that's why I missed spell check and sync. But it is still a huge stretch to call IE10 a good browser compared to it's competitors considering spell checking is more than half a decade old and bookmark sync has been around for more than a year, and it doesn't even have the other features on my list. It hasn't even caught up with feature leaders like Chrome, Firefox, or Opera.

[Silhouette]

Isn't it more important that a browser implements, well, web browsing? I don't think any of the features you mentioned is particularly significant, relative to a robust rendering engine that supports useful technologies like HTML5 and widely accepted parts of CSS3, fast performance running JavaScript, and simply being a stable, secure product.

In any case, if you're going to pick on usability features, you could just as well criticise Firefox's tabs architecture, which has horrible security and performance problems as a result of fundamental architectural flaws that every other major browser overcame years ago. Or the way Firefox and Chrome move UI elements around or subtly change their appearance with each new release. Or the way Chrome looks more like a glorified app store every six weeks after it actively circumvents the basic security model of my computer's operating system to update itself. Or plenty of other problems with mainstream browsers that IE hasn't had for years, for that matter.