I am still a BIG fan of Freedom Fighters. To this day it is easily my favorite game. I dream of the day that Freedom Fighters 2 is created with melee stealth kills. At least a knife... Totally an underrated game.
Anyway... Here are games like it that anyone who loves freedom fighters should check out.
SOCOM (pretty much the whole series. 3rd person, squad based, stealth.)
CONFLICT: Desert Storm (1 & 2 are the best) another of my favorites.
Mercenaries
Rainbow Six Vegas (1 and 2, both awesome games. It isn't technically 3rd person, but it's a good mixture since you can get against walls and what not.)
The Warriors (Not a shooter, but it's my favorite fighting game EVER. I want another game like this.) Squad based (sort of), 3rd person. Way too much fun.
Godfather 2 If you like Freedom Fighters you'll probably love this. It wasn't rated very high by the general gamer population, but man it's fun if you like 3rd person squad based games. You can level up, level your mafia members up, send them on missions of their own, or order them around as they defend you. One of the most underrated games today in my opinion.