i think i'm in the minority in thinking that this ban is way too harsh. i don't think these three bites are too different to headbutts, other than that you see headbutts more frequently in football matches. had this had been luis suarez's third headbutt of his career, i don't think the ban would have been as harsh.
personally, i think there are far more worse actions in football. such as two footed tackles, where the offender can only be aiming to genuinely hurt the opposition. and these don't get punished anywhere nearly as severely as suarez has been. i would have banned him for 4-6 matches maximum, on the basis that i do not see a difference between this offense, and other offenses that deserve 3-6 game bans.
i think suarez is a "victim" of a bite being such as unique thing to do on a football pitch. as well as fifa being under a lot of pressure (for other reasons)