Feel like I'm one o' the few people who LOVED FC2. The hunt fir those diamonds actually made sense: once you bought weapons with them, they were "unlocked" and free to pick up in any ingame shop from that moment forth. It added a great sense of achievement and even an RPG aspect to the game.
Ambushing jeep patrols didn't get old either.
Man I'm going to reinstall FC2 tonight!
Ordered FC3 for €20,- (about $25,-) on WOWHD.com . 20% off for any game 'til the 20th of Nov.