Mic There are some negatives of course - for one, with "big" games, a la triple-A, the battery life isn't great, however it can go VERY far with older or less complex games, which is great again!
The Touch Pads are surprisingly great and work super well for mouse-driven games and the Desktop - wouldn't want to miss them on future devices.
The screen on the LCD is just... Okay. It's probably the biggest weak point of that version.
There being only one USB-C port is a bit annoying, as sometimes you wanna be able to plug in more than one thing without a hub. It would also nice to have one on the bottom, for easier docking. The port is also not Thunderbolt-Compatible, so no external GPU is supported.
Steam OS is great, but some games won't work and modding some games is more complicated due to having to use Linux. You can install Windows - but that comes with other compromises in turn.
Emulation is very nice and works all the way up to Switch and PS3, altho not all games will run perfectly.