What you got? Seems good seen as BF4/N4S cost £20 alone.
For £20 per year you get Battlefield 4, Madden 25, Peggle 2, Fifa 14 and NFS Rivals.
As long as theh are in the Vault you can play them (and you keep your subs going). More games will be added at a later date.
You also get some early access and discounts to games and dlc (although EA digital prices are usually high).
I reckon it is a great deal.