Honestly, I have the opposite reaction to Tavern Brawls
I don;t mind the RNG pre-set up ones, I kind of hate the "construct a deck" variety. Simply because I want to click "Brawl" and go and deck building takes so damn long. Especially when it crashes 2-3 times (on iPad) while making the deck, so you have to start all over (it only saves the state of the deck when you exit the builder.) I would love, love, love it if you could pre-load one of your existing decks and just change a few cards for the Tavern Brawl. For example, in the death rattle brawl I could just use my Rogue N'Zoth death rattle deck and see how it goes. But I can't, I have to spend 10 minutes selecting all those cards again just to see if it works at all or not.
Otherwise, yeah the meta is getting stale. The Jade Golem mechanic was neat, but they didn't give players the mechanics to handle it. For example, why weren't these types of abilities included in cards to stem the horde of Sham and Druid jade mobs:
"Destroy all minions above 7 attack on the board"
"Take over your enemy's highest level jade golem"
"Destroy all Jade Golems but the one with the lowest attack"
"Subtract 2 from opponent's jade golem count (but not below 1)"
That's just off the top of my head, but there is NOTHING like that int he expansion. Huh? We needed something to head off the jade freight train once it gets rolling. I'm not whining as a loser either, I play Jade Sham a lot these days. But once I get that sucker up to speed mid-game, unless you get super lucky or are another jade deck, I'm going to grind you into dust. One of those cards would stop my deck cold (and wouldn't be unbalancing because if you're not playing against a jade deck it's useless.)
Blizzard seems to have this sort of oversight a lot.