From season 1 thru season 3, she had progressed, grown, had some depth to her, not just hell on wheels (don't get me wrong, I like hell on wheels, but I like more, you know), and i loved her for it...brawn and beauty that started to mix great with a bit, just a smidge, of other emotion; she regressed the entire season 4. I almost turned it off whenever she threw the dishes in the kitchen, after learning about John and the protest girl...that entire scene about ruined everything for me, that's how bad it was, and how much I hated it. She was turned into a caricature, way too many one liners that grew old real fast. It's like they took the things I liked about her brawn and toughness, and ramped it up 1000 fold, and it grew so very stale, whenever it was perfect right where it was at. I hope it improves with season 5.
Of course, tbh, overall, I was pretty disappointed with the entire season. Waaaaay too much Jimmy in Texas, way too much. Nowhere near enough Kayce and Jamie, or Thomas. Started with a bang, but sloooowed way down. Holding out hope that it was for a reason.