It can run all your Steam games since it is a full Windows PC. However, many Steam games are designed for a keyboard and mouse. So expect to use KBM attached to your PC. But because it's a full PC, you can attach whatever peripherals you want. I use a wireless Xbox 360 controller, Xbox One controller.
I also have a couple of USB 3.0 hubs so I can attach multiple USB devices simultaneously. Also, many Windows tablets also come with Bluetooth so you can connect wireless Bluetooth devices like speakers, headsets, keyboards, mice, etc.
The biggest limitation is always going to be Intel graphics and RAM (since Atom machines only have 2 GB of RAM). Intel graphics hold back the Core i3, i5, and i7 processors.