Wii 9/10 Not as many games as the other systems, but way cheaper. Has a unique library of around 25 good games that are almost all exclusives. Backwards compatible with GameCube.
PS3 8/10 Good exclusives, but slow to take off. Lots of games run kinda bad on it.
360 9/10 Almost no exclusives, but didn't try to screw the consumer from the get go like Sony. Good online for it's time, and gamerscore was brilliant.
XB1 3/10 Pretty useless machine. No exclusives thanks to every game also being on windows. Doesn't get a lot of the AAA Japanese titles that come to PC and PS4.
DS 10/10 Huge library of games almost all of which are unique to the system. Great battery life and backwards compatible with GBA.
PSP 7/10 Kind of expensive, but it does have a small library of good games.
3DS 10/10 An even bigger library of games that are almost all 100% exclusive. Backwards compatible with DS. Plays GB/GBA games from the e-shop.
Vita 4/10 Virtually every good Vita game can be bought and played on the PS3 or PS4. There's no reason to own this system outside of wanting a portable gaming experience.
Wii U 6/10 A unique library is about all that saves this from being ranked as low as Vita/XB1. Backwards compatible with Wii.
Switch 9/10 Really good library so far. Quality construction, and the most powerful handheld ever made. Great games coming out in the first year. Battery life could stand to be better by an hour.
PS4 10/10 Gets all the good multiplat AAA games whether they come from Japan or the west. Almost as many AAA exclusives as Nintendo consoles. The system absolutely blew up this year with a metric heapton of games that are either exclusive or semi-exclusive. Choice to get either the Pro or a cheaper model.
