Not many people play BC1 anymore.I guarantee people are playing Bad Company. I'd recommend Red Faction as I'm a huge fan of it, but not many people play it since it is quite old. People still play Rainbow Six Vegas 2, as I have it, but I'm not sure about the first one.
It depends on the Call of Juarez, cause there are a few of those.
I'd say Bad Company are the best out of that list. You'd get the most out of it I think.