PS4=9.0
Xone=8.0
WiiU=7.0
3DS=8.5

PS4 - 8.6
3DS - 8: Haven't played my 3DS XL much since Pokemon Y came out, it's still a good handheld though. Looking forward to Yokai Watch.

3DS - 6.5
Vita - 5
Wii U - 3.5
PS4 - 1

All consoles start at 0 for me and go up as I play and enjoy more games

PS4 - 7.0(would've been 6.0, but gets an extra point because of the decent hardware.)

Wii U - 8.5(My only 8th gen console that has been played nonstop, it would've been a 10 if games had way better AA.)

XB1 - 5.5(Has good games, but most of them are online based, and I'm not much of an online player)

Vita(Just got this past holiday, so I still can't comment much about it.)

Ratings based on the console's hardware and its exclusive games. 

PS4: 9

WiiU: 8

PSVita: 7.5

PS4 9.5 PSV 7.5

PS4 - 8 / 10.

Xbox One: 6,5
Not enough blockbuster games yet, but the system is awesome.