It's a mixed bag. I'm obviously heavy on brawn, but I'm more interested in having a 4 in will than a 7 in brawn, and I'll probably bump my agility a little at some point too. One of the other players has built his character almost entirely around having a 7 intellect and using intellect to do basically everything, another one of the players has either a 6 or 7 agility, and then our remaining two players are more well-rounded with a variety of 3s and 4s. This is our first campaign with this system, so we're all still learning the system, but to be honest we actually started off as a well-rounded group and the system pushed several of us toward more min-maxing. My starting stats were the same as they are now, only my brawn was 4. The 7 intellect player started with a more well-rounded character, but after getting a few sessions under his belt asked the GM to let him rebuild. And the agility player built this character after her first more well-rounded character died. We were all just failing at everything way too often when we were relying on 3s and 4s. Of the two remaining well-rounded characters, one of them still fairly reliably botches things he's built to do, and the other is a new player who has only played two sessions so far, so we'll see how she feels after a few more.
I wasn't thinking you were going to Brawn 7 as 6 is the cap. I mean, with a group of built they way you guys did, I can see why the GM spends a lot of his threat on causing you strain.