I watched the first four episodes last night after the pilot got a lot of praise but I'm not so sure about the show. The initial impression is good with decent production values and the concept is interesting. I've always enjoyed "Nazis won WWII" alternate universe stories. But as it goes on it becomes clear that it suffers from the same flaws as many genre shows: poor characterisation, bland actors, random plotting which is there to fill up time rather than serve the narrative. Alexa Davalos is fine, but the two male leads make little impact, reminding me of the similarly bland love interests in the Hunger Games films. The plot line with the bounty hunter seems redundant and the scenery chewing actor seems to have wandered in from different sort of show.
I think this is one of those cases where critics seem so impressed with the relatively original premise for a TV show that they are happy to overlook how ordinary it is in most other respects. Yes, it's very bleak (episode 2 in particular), but is that in itself worth praising ? So far the show hasn't made any points about fascism or totalitarian systems I haven't seen done better elsewhere. That said, the deteriorating relationship between Nazi and Japanese occupiers may develop into something interesting.
I love genre films but when it comes to TV I'm probably more into character driven shows than plot lead ones, and genre generally foregrounds plot. I try out genre shows but rarely stick with them for that reason. The only genre show I've seen recently which has strong enough characterisation that it could measure itself against something like Mad Men or The Sopranos is The Leftovers.
On a side note, the Disney kids flick Big Hero 6 appears to put a more cheerful take on the same universe, which makes that film retroactively creepy.