Tavern Brawl's just been a huge fucking dumpster fire. The game mode is not fun at all and outside of the -2 cost deathrattle, required almost 0 thought. Worse is that it siphons noobs off the other play modes so that they become even more competitive. Which, by itself, is fine. But coupled with current rewards, taking a decent to good arena deck to 3-3 because everyone else is playing around your level is just not going to cut it in the long run.
Constructed is constructed, your collection will dictate success more than your opponent's skill level. But tougher competition when the reward is a card back(and soon to be 1-3 golden cards) per month...meh?
I know some of you keep clamoring for tourney mode, but I think that's a mistake. Given how poorly they've supported Arena and Tavern Brawl, tourney mode will just end up dividing the player base even more.