Um...Left to right isn't the only Dark Horse formatting issue, here are a few more (but they really applies to the old Dark Horse Manga only):
1. Dark Horse used to do terrible covers, why not just use the original covers as intended by the original artist? Less works and a saver bet;
2. I hate Dark Horse's "white paper", they just don't feel like manga, they feel like my own office photo copy (however, I have noted that they have recently made this change, eg. Hellsing)
3. Dark Horse always enlarge the manga and they can cost twice as much as manga from other publisher (personall, I think it is a waste of effort and money, and I prefer the original manga size)
Edit
4. Dark Horse also has the bad habit of rearranging number of chapters within volums, that is, Dark Horse Vol 1 might have different chapter numbers when compare to the original. Bloody annoying because what was meant to be the climax in the original Japanese print, it is re located to the middle of a Dark Horse volume.