I'm sure that Mike will be releasing all sorts of Stats and charts for us to munch on in the coming weeks, but I thought I'd make a chart out of the info he's already released on overall codex performance at this year's NOVA Open.
As I see it, we can separate all the codices into 3 distinct tiers. Those that won more games than they lost, those that lost more games than they won by a little, and those that won barely more than one third of their games.
What was it Stelek said a few months back about the Dark Angels (or at least a certain kind of DA build) now being the strongest overall codex post-FAQ? That prediction seems to be borne out in their performance here. Just wait until Mantic releases it's Warpath models.
Squats as Dark Angels? Yes please. :)
Edit: Let's try this again with another chart that shows the granularity of the results, and hence indicates to some extent the variability based on the number of players for each codex.