I am becoming 95% convinced the meta has adapted a bit. The only core pirate warrior elements I'm missing are a second southsea captain and leeroy, and I don't think I've changed my playstyle at all, but the results have changed drastically.
With version 1.7 of my deck, I had a 68% win rate out of something like 30-40 games. Every deck version since then has been drastically lower, maybe around 40%.
I tried going back to version 1.7 and played 20 games. I won only 45% of them, and there was only once when I had 2 wins in a row. Most games feel like they have very few choices, and each play is quick and obvious. Each game is typically over by round 7-8. I really don't know why there would be such a drastic change aside from the meta at my rank shifting.
*edit* I really wish the decks in this expansion weren't so expensive. I'd like to try the Dinomancy deck above, but that's 800 dust alone for those two cards. I'd like to improve pirate warrior, but I need 2000 dust for 2 cards. I'd like to try paladin, but I need around 4800 dust. I have some cards for quest warrior, but that's an expensive deck too.