Should I play MGS4 if I've never played any of the other MGS games?

[bobobologna]

ssj12 said:
downlaod the MGS database off the PSN, It says add-on but it isnt. Its also free.

 

To add on to what ssj12 said, the MGS database will hide all information about MGS4 until you have beaten the game.  When you have a complete MGS4 savegame, it unlocks any information regarding MGS4.