Do people still play these online?

First off, I want to apologize for every person that has been asked this question a thousand times. This was the best place for me to ask though.

Anyway, I am looking at some older games for when I get Xbox Live to save money and am wondering if a lot of people still play these games online.

The games are:

Call of Duty 4: Modern Warfare

The first Left for Dead

Soul Calibur 4

Mortal Kombat vs Dc

Thanks!

CoD4 is still very much played.

#12 currently if I'm correct.

CoD 4 still is swarming online.