Adzma said:
I loathe them with a passion. Just look at Killzone 2, it's a brilliant example of why they're horrible. The sooner developers learn to fuck them off, the better.
Killzone 2's Trophies were an attempt to keep players in the online play... I didn't like KZ2's online multiplayer, so the prospect of grinding away at it for the sake of a few trophies didn't really appeal. In fact, it put me right off.
Battlefield: Bad Company 2 is an example of (in my opinion) good online Trophies/Achievements. They are inventive and encourage players to use all the Kit items (Rocket Launchers, Repair Tools, Motion Sensors etc) at their disposal, while not being too difficult.
Some are just plain funny:
(Roadkill with a helicopter, Headshot with the Repair Tool, get a kill with Knife, M60 and RPG in the same round)