This team is solid for a 12 team league.
I think the biggest concern for your team is obvious: the age of your running backs. Frank Gore and Michael Turner have been able to produce at an elite level for a long time, but it is possible that both might be starting to slow. At 28 and 29, Gore and Turner both have logged significant mileage in their careers. Turner has had huge carry totals for several consecutive years, and the wheels might finally come off in 2011. Gore is coming off of an injury shortened 2011, and has managed only once to play 16 games in a season during his 6 year NFL career.
But the demise of these two is far from certain. If Gore and Turner manage to stay healthy, they will have significant value as the focal point in their respective offenses. Even if Gore misses a few games with his typical bangs and bruises, the games that he does play will be at an elite level. Even if Michael Turner slows down towards the end of the year, he should be able to log decent numbers early if he is healthy.
I spent the majority of this post addressing your RBs because I like the rest of your team. Jennings, Marshall, and Ochocinco make up a respectable 12 team receivers corp. Owen Daniels is basically the WR2 in Houston, so will be a solid option at TE. Flacco and Bradford will be serviceable as a QBBC this year.
Good luck in 2011