Sony has just completely screwed up their trophy system. I have some unrealistically high, unearned score, I can't see when I'll level up. It's completely destroyed my enthusiasm for something I used to really love. My mom, who hasn't ever touched a game, somehow has a higher trophy score than I had pre-inflation, on the device she uses to play dvds. Yup.The value of a platnium is great. It allows you to really feel like you completed the game and have something to show for it. But it's telling that nobody ever says how many gold or silver they have because nobody gives a fuck.
Achievements are nice in terms of every achievement feels as if counts to my overall score to a greater degree then than your trophy level. I do wish they would bring back the 1000 point badges for games. No idea why they got rid of it.
And platinum trophies are still way better than gamerscore. It's purely psychological, but on an individual game level it means something. It means I loved a title enough to do it, and it's there on display for all to see. There are memories behind that little icon.
Maybe I get 1000g from 50 games, maybe I get it from one. It looks the same to a casual observer. I really do wish there was something to show I've completed a game on Xbox. It's about the only OS feature I really think Microsoft "loses" on in my eyes.