For such a long time I just hated this chain. It represented everything I hated about grocery stores. But I have to say that I've had 6+ months of good experiences here. (The Swampscott location).
The deli section is very good, but pricey. They have a very good pork section. And chicken. And produce. And surprisingly good prices on these. This summer my kids are loving their bakery goods, especially the breads. Haven't bought from the seafood counter yet.
As much as I love MB, It's just not a shopping experience I can deal with on a daily basis. I can park and get in and out of S&S way faster.
My biggest complaint with them is that those self checkout things rarely work, and the lines can get longish. But they seem to be stepping up their game.