Not to be that guy, but...

is 251 yards of offense really that bad when your average starting position per possession is the ULM 46 yard line?

Assuming the LSU 20 yard line were your average starting position instead (where a kickoff touchback goes, fairly normal-ish starting point for an offense), to keep that ratio of productivity compared to the amount of room you have to work with, you would need 437 yards of offense.

As we know, superb field position due to excellent defense and special teams makes for a short field, which makes it difficult for an offense to pile on yards. I used a ratio of total yards : average starting position to get a feel for what we should expect the offense to produce given the field lengths they're given to work with. Were the LSU offense put in a more "normal" starting spot (the 20), they would be expected to produce 437 yards of offense performing at the level they did on Saturday; the dip in production is due to the fact that compared to this "normal" starting spot they were missing 43% of space to move, not because the offense was performing badly with the space given.

I therefore submit that the offense is just fine, and that the low yardage production is a good thing because it indicates not offensive impotence but defensive and special teams brilliance.