Like:
NGC - I just love it. It looks so cute
No, really, how can anyone not like the design? And the exclusive titles - Metroid Prime, Wind Waker (underrated!!!), Resi 4 (originally...), Mario...
N64 - cartridges - enough said...
DC - very nice - small, powerful, great exclusive games (Shenmue above all, Sonic Adv.), arcade ports - shmups, fighters...
XBOX - noisy, huge, heavy, by Microsoft, but for some reason I like it. Probably because of how versatile it can be with XBMC, emulators and the graphics still rocks today.
PS2 - I have the latest revision and it' just so much fun in such a small package. Soooo many games - FFs, GoWs, Ico, Okami, MGSs and thousands of others...
Mega Drive - an honest console with great games and controllers.
Sega Saturn - an ugly ducking sort of, but has some great exclusives - PD Saga, Nights, Radiant Silvergun...
Gameboys, NDS - Mario in my palm? What can be cooler???
I don't like (S)NES very much, I don't know why, maybe cause I've never had either of them...
PSOne - the first console I had, it's OK, but the beginnings of 3D gameplay were painful...