This season just keeps getting better and better. The first episode is a bit dull. i understand why they had to go with it as a season opener, but it was a real turn-off.
Episode 2 felt like a real classic Star Trek episode, was pretty good, but nothing special.
Episode 3 was fantastic. Twists and turns, and no idea what was going on until the end.
Episode 4 was excellent. Not quite as good as 3, but still fun.
There's definitely a reduction in the amount of humour overall though. Probably isn't coming back; it seems like they want it to have a more serious tone, which is ok, but I do miss the early S1 jokes.