Ha, I was one of maybe 15ish designers. For BL2, the level design team mostly split our disciplines to allow each one of us to better focus on specific things. There were maybe 5 or 6 of us that did mostly visual design and level building, 8 or 9 more that did mostly scripting and combat, and 2 or 3 guys that did some of both.
I just happened to do a proportionately large amount of maps because I was on the project for so long and because I was focused on layout and visual design.
Then we had another design department working on making enemies, skills, weapons, interactive objects, etc. Most of these guys come from a level design background.
Also wtf is Raid damage added to melee attacks on some shields? Is that just a fancy way of saying extra damage?
I think so. I not entirely familiar with all the stats you find on the items so that might be wrong.
How the hell was the golden key exploit overlooked and what are they gonna do about it?
Things slip through the cracks sometimes. Think of it this way: Gearbox and 2K both have dedicated QA teams and they find a lot of bugs. But those QA teams are small relative to the public. When you release a game into the wild, from a QA perspective it's like your QA team is now several million strong and many many more glitches and bugs are found. A good example of this is dragons flying backwards in Skyrim. This was a relatively rare bug and it's no surprise that Bethesda and their QA staff didn't catch it before release. When suddenly millions of gamers get their hands on the game, rare bugs like this are found. It was the same for us with the Golden Keys glitch.
And I think it's been patched already. Last night when I played from home, Steam updated my game with the fix. And though we've plugged the hole, we aren't going to punish people who used the exploit.