After the decline of the PS2, I'm really just getting back into console gaming with my PS3. I've never been a fan (nor a hater) of the CoD series, but it's so popular I'm looking to pick up one of the games so I can play online with friends. I'm definitely looking to go used and save some money, hence why I'm not going to wait for Black Ops 2.
Which CoD game would you recommend for someone just trying out the series for the MP? Black Ops? MW3?