I've only seen season 4 once, so I could probably do with a rewatch, except so much of it makes me so angry (all that mutiny stuff causes too many feelings in me, that I don't know if I could do a casual rewatch of it!)

And I agree with you on feeling sort of meh aboutt the 4th season of Fringe. I love it, but there's just so much that's left unexplained that it gets too frustrating.