2K Boston didn't make Tribes: Vengeance. That was the Aussie studio.
Well if you want to be really nitpicky it was Irrational Games in Australia. They weren't "2K" then.
IG Australia, IG Boston, who cares. They both seemed to have the task of taking Sierra/VUG games and dumbing them down for the masses. The end result actually was watered down games that didn't appeal to either the hardcore fan or the casual gamer. They killed both series that they were hired to bring to a larger audience.