The campaigns of both Rainbow 6 Vegas 1&2 have you lead an AI squad. It's more of a tactical game, with little room for error, unlike halo or gears. Yet not overly tactical like the original games, which led to very steep learning curves.
To top it all off, you can even play Terrorist hunt mode just with your AI squad, instead of online coop. You can customize difficulty and enemy density.
I remember back during the PS1 days, I was so fascinated with AI teammates. Use to play Syphon Filter like crazy to satisfy that urge. Too bad those yellow Biohazard dudes never lasted too long.
Tom Clancy's Rainbow Six: Vegas & Tom Clancy's Rainbow Six: Vegas 2 is worth picking up if you are interested in a FPS/TPS hybrid. I also highly recommend the Mass Effect Trilogy, which is a TPS with RPG elements.
We must reverse Citizens United, Restore our Democracy, and Save the Republic. Join the Fight for Free and Fair Elections in America! http://www.wolf-pac.com