Nebraska has had good, occasionally great but too often mistake-prone offenses under both Beck and Langsdorf.
They were both handed dual threat quarterbacks with sub-average completion percentages, and fared about as well as other OCs with mercurial dual threat QBs. There are a lot of them out there, because dual threat QBs are really dangerous when they're working, but liabilities when defenses can rattle them.
You have to give Beck credit for Abdullah, in as much as no other team wanted to feature him as running back. For that matter, the maligned Beck and Watson oversaw three of the top rushing careers in Nebraska history with Helu, Burkhead and Abdullah. All three are currently in the NFL. While regularly operating a Top 20 rushing offense, Beck managed to guide Taylor Martinez to virtually ever passing and total offense record in Nebraska history. And Bell to the career receiving record. Langsdorf might well be the guy to help Tommy Armstrong break that total offense record. You can't say he had anything close to Abdullah, Burkhead or Helu to help keep the running game honest.
Know what? Our defense has kinda sucked recently.