Trophies will be in all games or close to all games in the near future. Now that all games are being developed in a post trophies world most will have them in short order (most 09 releases and beyond).
The big difference between trophies and gamerscore beyond the level thing (which I do like better) is the platinum trophy. In 360 games, at least later ones, there were usually a bunch of easy trophies and a few hard ones. Most of the time it would be worth it to play though the game on hard and do a few other things to max out at 800-900 points pretty easily, but then there would be a few really hard 25 point rewards that just weren't worth the time. On the PS3 its totally different since getting that one trophy for the REALLY hard task is required not just to get the gold trophy but also to get the huge point game clearing platinum trophy. It really encourages full completion.
Also the 360 has some horrid gamerscore inflation because of release titles with REALLY easy achievements. You can get super easy points from games like NBA 2006 where you can get all 5 200 point achievements in the space of a single game. There are at least 30,000 gimme points you could get in a few weekends with gamefly, there are no such things on the PS3, it was made after people realized the point of making them challenging and worthwhile. If you see someone with a 50k gamerscore it isn't immediately clear whether he just grinded gimme games or earned it, with a higher lv on the PS3 you know he earned it.
PSN ID: ChosenOne feel free to add me
