I have a personal aesthetic and design that this theme is ideal for -- I've been using polaroids for about half the year, and searching for a simple theme in the same vein that doesn't have the particular design elements, as it is the aesthetic I like.
Spun delivers that.
I would, personally (and solely personally) like to see theme options added that give greater flexibility over font/typeface style and size, incorporates automatic Drop caps, odds and ends to make it more useful for me, in other words. Since my blog is primarily longreads in nature, I appreciate a good theme that allows me to let people focus on the ideas, not the chrome, of the site.
I am not anyone special, but I like this theme, and the only reason it doesn't get higher is that I'm also a really picky sort who is just to damn lazy to write her code, so I love it when people do outstanding work like this.