Yeah, most non-MacBook laptops tend to be pretty big. My MacBook's got a 13 inch screen and I prefer to keep it in a shock absorbing rubberised plastic case.
With the specs Caliber mentioned, you can run a lot of stuff easily on medium settings- I know I can run Team Fortress 2, Garry's Mod, Insurgency and Ace of Spades, but idk about many others.
(@caliber I've had difficulties using my laptop's touchpad for gaming as to do a right click you have to press down on the touchpad with both fingers. I bought myself a £10 wireless mouse off Amazon and I haven't looked back)