^That can be managed from an overall list, though. With XBL, you can compare games side by side - so if you wanted to compare who had more trophies in Halo, you could do so.
I wouldn't mind having them. I like that SSFIV3DE has them - it gives me something to work towards after I finished up Arcade stories, which didn't take very long. They give completionists stuff to do, especially in fighting games where all there is to do is fight. I think it'd be cool if Nintendo developed a system that would let developers implement their achievements and such into the Friend's System, so that we can actually view what our friends have, without needing to have the same games. You know - I'd go to my friends list, click my friends name, and it'll show a list of games they've played, and it'll tell me what achievements they've reached in titles that support them. There doesn't need to be a point value associated with them, either.