Honestly, SG has some troubles with editing when it comes to the first print run of their rules. What I will say is that they are great about errata at least so it tends not to be a problem for long.
As for learning the rules I found that the best way was to read it front to back and not skip anything. The problem with a lot of the rules is that they are heavily interlinked with each other, and while some extra time on layout could have helped I doubt it would leave everyone happy. But I found that when I read the whole thing in one chunk without skipping any sections it was a lot less confusing. So it'll be a bitch to search for some stuff in there but it was a pretty simple affair to sit down and learn the basics.
For the most part the rules were easy to grok and thankfully odd omissions like what one rolls for the crit chart are rare. And it at least isn't as bad as the first printing of Uncharted Seas where they never explained how a ship with 0 HP sank (that one took a while to find on the forums). They've gotten better to be sure, but still have a ways to go.
But hell, the games are damn fun and they are good about supporting their products after release so don't fret too much. I personally see most Spartan games as living things that change over time and I'm sure DS will at least be similar in that regard. The important thing is to hop on the SG forums and post questions and comments so they can fix any problems.