You mention that it dips below 60 fps quite a bit, but at the same time, black ops' PS3 average framerate is closer to 40 than it is to 60. So there you have it, your laptop pushes out a higher framerate, while you also have something around 3 times as high a resolution. If I'm going to make a guess, I bet you run the game with higher res textures on your laptop as well.
In addition, your laptop doesn't just run your game. At the same time, it runs a gigantic, enormous OS, with a lot of applications in the background, while still keeping your framerate high. At the same time, XMB slows down tremendously when displaying it during a game, even if the game you play is really, really, really lightweight. It happens to me even when I play Disgaea 3, in the headquarters with almost nothing going on. I just don't think you're giving your laptop as much credit as it deserves.
As far as color vibrance goes, that's most likely to be due to you playing it on a laptop monitor, which are notorious for having poor contrast ratio and brightness levels, while in the TV world, the LCD panels are generally a lot better. Maybe you even have a plasma TV, which offers even better picture quality. However, the PS3 is probably not the one to thank for this, it's most likely the TV.
The impression of there being less details could be a by-product of your monitor not showing contrasts as well as your TV does, so those might one and the same issue.
In either case, the resolution doesn't tell the entire story, of course. However, it does tell an important part of the story, seeing as the resolution has a very direct impact on how much juice you need to display a frame of a certain level of detail.





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