Linemen generally take a year or two to hit their stride, and it was one reason why I was DELIGHTED with our draft this year... we took several linemen, then signed another potential keeper as a UDFA.
Taking many shots is a better idea than drafting one guy, forcing him to play, and then being pissed off that he's not a star already before he really gets it.
I really like the guys that we've drafted, but expecting them to play at an average NFL level right out of the box is probably a mistake. That said... I'm FIRMLY against signing any retread older players to play right away. C'mon guys... we are rebuilding, not competing for this year's Super Bowl. The best thing that we can do is let these young guys play, work with them when they screw up, and let them develop with less pressure.
Those of you calling for us to sign 38 year old players really don't understand the state of our team, and being THAT impatient is what led us to our years of misery.
Grow up... try to remain patient... and cheer for the young guys when they get it right.