If you have a 1st generation Core i3 CPU with the Intel HD graphic core, then I would say no to all games. I don't know how demanding COD MW3 is though.
If you have a 2nd generation Sandy Bridge Core i3 CPU with the Intel HD 3000 graphic core, then it is possible to play Skyrim on low settings with okay frame rates. However, Bethesda games do not recognize Intel integrated graphic cores so you need to download a D3D9.dll file originally created for Oblivion. It think it tricks the game into thinking you have a nVidia 9600GT graphic card. You need to lower the settings since the HD 3000 is definitely nowhere near as powerful as a 9600GT.
http://www.oldblivion.com/sm/index.php?topic=6928.0
Assuming you do have an Intel HD 3000 graphic core, then you should be able to play the Mass Effect trilogy. For the hell of it, I completed Mass Effect 3 on my laptop using the Intel HD 3000 graphic core instead of the GT 550m and I found the game to be quite playable given the relatively weak Intel HD 3000.