I've got a team (upper 50's) that was intended for the 70-74 bracket.
Got sidetracked with other teams, but the idea is still appealing.

One of the allures, is essentially best in slot gear (some Sunwell gear is comparable) from a weekend or so of battlegrounds.
And then your weapons/gear never needs to be upgraded; every new arena season makes your gear sub-par for maximum level toons, but at 70th (once geared) you always have equivalent gear to the most geared players and better gear than many.

Cataclysm greens would essentially be the same deal.
Most likely purchased over time, on the AH... instead of acquired through running BG's.
The best gear possible, without ever needing to upgrade it.

The 75-79 bracket precludes arena play.
In the 70-74 bracket, you can arena at 70th (and only 70th) if you want to.

I know the 70-74 bracket is very active on most battlegroups.
How is the 75-79 bracket?