CTI is very fun mission, it's the best OFP MP mission I've played. OFP shows once again for CS nerds that this game is not about AIM-skills or speed, it's about tactics - pure and clean tactics.
I love this mission because I kick a lot of ass in it! The most players "follow the group", I don't. I "build" my own camp with ambulance and ammo truck. Then I take over small towns, alone with my spetsnaz soldiers. After that, I destroy enemy convois and towns using tactics of chechen rebels.
Once I destroyed 2 M1A1's and two "5truck" loaded with people and ammo - with just two satchel charges!! Lol at them.
(In case you want to know, the enemy never found me!)