Call of Duty 4 Review Round Up
Here is IGN’s CoD4 Review
Call of Duty 4 offers 16 maps and thirteen multiplayer variants out of the box. PS3 and 360 support 18 players online (a number that could increase at a later date) with PC offering 32-player matches. Other than the number count, multiplayer is identical for all three systems. This is in terms of modes, map layouts, visual fidelity, and performance. Top to bottom, COD4 runs fantastically. On consoles you may see a few random moments of lag hit, but in my experience, these were so rare that I hardly noticed them.
Here is 1up.com’s Call of Duty 4 Review