Was Earl Mitchell worth 49ers' big contract?

Daily 49ers blog for NBC Bay Area website: Defensive tackle Earl Mitchell will get as much as $16 million in new deal with 49ers, yet he's been rated -- for the most part -- as nothing special in eight seasons in the NFL. http://www.nbcbayarea.com/news/local/Can-49ers-New-Defensive-Tackle-Live-up-to-Big-Contract-414880843.html