Medal of Honor Tier 1 , battlefield bad company 2, modern warfare 2, or black ops (PS3)?

I want to spend as little money as possible and it has came down to these 4. Are any of these not worth the price?

Medal of Honor Tier 1- $27.99 bestbuy

Battlefield Bad Company 2- $39.96 walmart

Modern Warfare 2- $39.99 gamestop

Black Ops- $47.99 bestbuyMedal of Honor Tier 1 , battlefield bad company 2, modern warfare 2, or black ops (PS3)?
black ops betterMedal of Honor Tier 1 , battlefield bad company 2, modern warfare 2, or black ops (PS3)?
personally i find blacks ops the most boring game but i find every cod boring after cod 4, battlefield i play tons of, and out of all them i would have spent most my time on battlefield but bf3 comes out later this year, CANT WAIT!Medal of Honor Tier 1 , battlefield bad company 2, modern warfare 2, or black ops (PS3)?
Black Ops is definitely worth it. I'd advise not getting MW2 if you want to play online, because the online play on it on PS3 has died. Black Ops is my favorite of all these. Second best would be Bad Company 2.
Modern Warfare 2 or Black Ops. Although I will prefer MW2 more.

chuckie cheese