Automatic graphic performance detection implemented by game isgames are often wronginnacurate and in the case of Bethesda games (like Skyrim) this often become "almost always" (Iwould often be more appropriate. I don't know much abouthave any experience with Saints Row 3), however it may suffer from similar problems.
In the specific case of your GeForce 550M I must say that it cannot be considerconsidered a mid/high-end card but it is instead part of the low-end card segment.
You can forgot to playforget about playing Metro 2033 at Maximum settings, I am sorry; "Can you run it?". Can you run it? is generally not a bad service but probably their results are not always verified100% accurate.
At 1366x768 these are validshould be more accurate FPS values for your graphicgraphics card when running Metro 2033.
- low: ~ 77 fps
- med.medium: ~ 42 fps
- high: ~ 15 fps
TR;DL There is nothing wrong in your settings, your GeForce 550M cannot do more than this. Try to lower resolution or graphic settings to get more FPSincrease performance.