Can you please detail what you found so horrible ? Would appreciate some more info on that.
How much time do you have?

I certainly don't have enough to report everything and I'm confused why it is that I found a ton of these problems in the first few hours of using it. And I'm not even purposefully testing it. A few examples below, there is a lot more than that.
Some issues are trivial, like spelling errors:

Some are just "WTF" - like the 503 error itself - no idea why it's throwing it. The site is not down for maintenance, I can log in and use it.
Timezones are broken:

Some quote tags don't display post link/timestamp at all. I don't have a screenshot but IIRC it happens when thread ID has an underscore in it.
Admin panel: created a category, created a board, dragged the board to the category, hit Save - board disappeared. No idea why. Next time it worked correctly. Then I started dragging another board, changed my mind, dropped it back into Uncategorized Boards - it disappeared. Drag-n-drop itself is clunky. The following board will end up in EpochTalk Testing despite me holding it on top of (or even slightly below) General:

And then there is usability... or lack thereof. I'm gonna give it the benefit of the doubt and assume I just don't know how to configure something, although I'd think it should be user-friendly out of the box. For example the post editor. On Bitcointalk you click a button - you get a smiley, you click another button - you get image tag, etc. Do I have to type everything by hand in Epochtalk? Image drag and drop doesn't work.
Capitalizing all board/thread titles is unnecessary and messes up stuff like camel-case code.
Newlines are converted into something weird, looks like two BR tags. Vertical text spacing in general is... I was gonna say horrible, but I feel like I'm overusing that word. It just doesn't look right:

I haven't yet found a way to put two lines of text on top of each other without a blank line in between, other than to use something like a bullet list.
If you put three hyphens on a line like this
---
The hyphens disappear... Apparently there is some sort of markup allowed (in addition to bbcode) but no help or documentation that I could find. I thought it supports
Markdown (readme mentions it) and that's why I tried hyphens but it didn't produce a horizontal line like it was supposed to.
No image proxy unless again I don't know some setting or something.
Double-clicking the "Send Reply" [sic] button will duplicate posts (no warning).
First let's have User Testing. Once a majority or theymos is satisfied with the result we'll talk about the pro QA guy/gal

I disagree. We've had this available for user testing for months if not years. QA is one of those things where you get what you pay for.