Of course our offensive line is going to suck. The offense was so predictable, an amateur knew what downs they would run or pass. When you have 3rd and 9 on a consistent basis, with a qb who holds onto the ball too long and is indescisive, your OL will ALL look bad.
The OL is fine, re sign Sims for a two year deal as a back up, and move forward.
If Harbaugh can do what I think he can, Defenses will no longer put 8 men in the box on running downs, because if they do it will be a quick pass outside of the box. Hopefully more first downs and 3rd and 2's, and voila the OL will rate better.