I'm in a bit of catch-up mode, so I'll keep this brief: I'm REALLY glad the Doomed storyline is over.
This was a case of too many ideas coming together in a messy way. I can honestly say this was not a story I'll be anxious to re-read.
That said, there are some nice moments and I am interested to see where they take it next.
Samurai Jack is doing a big universal change in its arc and is handling things much stronger in my opinion. If you're curious, check out the video or these scores below:
Superman Doomed #2 - 4.0/10 (and I might be a tad generous with that score)
Samurai Jack #12 - 9.2/10