I watched a few review videos and all said it was a pretty solid laptop. Yes, the laptop's body is made of plastic. That's they way it seems they (the manufacturers) are going these days with laptops to make them lighter and easier to carry.
I did hear that the keyboard wasn't back lit in each video I watched. So it may or may not have back lit keys. It's not really that big of deal, unless that's what your really wanting out of a laptop.
Some of them are kind of strict.
If you're not really sure, you can always ask at the official Sims forum on the tech board, may be in this thread -
http://forums.thesims.com/en_US/discussion/942716/which-one-would-you-choose-gaming-laptop-decisions
Or this one -
http://forums.thesims.com/en_US/discussion/769718/good-laptop-for-running-the-sims-4
Ask phoebebebe13 and chesterbigbird their opinions. They're really good at helping picking out a laptop and saying what's good and bad.