Tried to utilize brackets at the LGS yesterday and it was a massive failure.
First and foremost, I had to listen to every dork make the same joke about their [[Edgar Markov]] or [[Atraxa]] being a 1 "by definition" (Seriously, this has to be one of the least funny communities I've ever been apart of)
Essentially, here's a summary of the issues I ran into/things I heard:
"I'm not using that crap, play whatever you want"
"I don't keep track of my gamechangers, I just put cards into my deck if they seem good" <-(this one is really really bad. As in, I heard this or some variation of this from 3 different people.)
"I don't wanna use the bracket, I've never discussed power levels before, why fix what isn't broken"
"I'm still using the 1-10 system. My deck is a 7"
"This deck has combos and fast mana but it's budget, so it's probably a 2" (i can see this being a nightmare to hear in rule zero)
"Every deck is a 3, wow great discussion, thanks WOTC"
Generally speaking, not a single person wanted to utilize the brackets in good faith. They were either nonchalant or actively and aggressively ranting to me about how the system sucks.
I then proceed to play against someone's [[Meren of Clan Nel Toth]] who they described as a 2 because it costs as much as a precon. I told them deck cost doesnt really factor in that much to brackets. That person is a perma-avoid from now on from me. (You can imagine how the game went.)