MFA is trading close to its "book value" (what you would get if you closed the company down tomorow, sold everything, paid off all debts, and shared what was left proportionately among stockholders), which is currently $7.42/share. What that indicates is that MOST investors seem not believe they have any future potential, thus are unwilling to pay any kind of premium...
http://finance.yahoo.com/q/ks?s=MFA
Furthermore, compared with their "competitors", they look to seriously lack earnings growth in the future...
http://finance.yahoo.com/q/co?s=MFA