It is an epic quest isn't it? Expecting characters to have epic gear in order to guarantee on 2+ with aggro doesn't seem unreasonable.
What Cratesmasher and you have demonstrated is that the extra 2 points in STR isn't needed -- validating Therigar's point from the weekend.
The question about gimp or not gimp is just a distraction. But, since you've shown that hitting on 2+ is possible w/o the extra 4 STR points I'm sort of leaning to yes, missing on a 2 is gimp when you are talking epics.
I'm sure you'll define gimp for us now and make a lot of distracting points in the process.