So the fighter's final attacks would be at:
+10/+8/+5/+5
His normal ones don't get any penalties, right? or do they start with the -2? Which would be (with the -2)
+8/+8/+5/+3
The book does say that he gets -2 for each attack, so the first one can't be correct, forget I even posted it, but would the -5 include the original -2? No, probably not, so it'll end up:
+8/+8/+5/+5, or, +8/+5 Mainhand, +8/+5 offhand.
That means that with the third feat, it'll be his BAB as normal for the lower ones, but his first will be at -2, and he'll get a bonus one off his main BAB at -2, -5, and -10.
Guess 3.5 didn't make this as clear as it was before. Oh well.