Trilligan said:
I could see your point vis-a-vis PvP scenarios, but even then it isn't a matter of the build being 'broken' - it's weighted specifically towards someone new to shooter mechanics, so the assumption is that the player wouldn't last in PvP anyway. No matter what the build did to buffer the difference in skill, experience and tactical knowledge would still weigh the game more heavily against the BFF.
I actually wasn't even thinking about PvP until you brought it up.
Then again, PvP is very unbalanced in Borderlands 1; assuming equal level, whoever brings the bigger stick wins (Hunters and Sirens are uniquely advantaged there anyway; Sirens being gamebreaking already, and Hunters having access to Trespass, which is very very overpowered relative to most other passives)
As for the rest of the game - why should one player having an easier time of it affect the other players at all? If it's cooperative, then the increased survivability of one team member will only increase the survivability of the group as a whole. And if the problem is that 'Easy Mode' will potentially dampen the experience for gamers looking for greater challenge - well, I guess that's a problem, but without a clearer idea of how the build works it's hard to say how great a problem it could be.
The latter point is the problem I was focusing on, though it would only really apply to pub games. Co-op with friends would be easily handled.
Incidentally, I find that Borderlands 1 becomes much more challenging with 4 players than it does with 2 (though 2 is easier than 1 due to the added benefit of revives).
