Sega megadrive.
I was gaming well before the Megadrive came out, (you know, on atari VCS & my Green screen Amatrad cpc 464) But the almighty megadrive was the 1st console that got me truly hooked on gaming, i'll never forget the days when myself and a group of buddies would all pile in to one mates bedroom and we would all sit there waiting in anticipation for our go on the console (with a beer in our hands to keep us occupied whilst we waited of course 
)
We would play all the multiplayer games like Street fighter 2 championship edition, Mortal kombat 1 & 2, Micro machines (multplayer heaven back then) Fifa 94/ 95 / 96, etarnal champions, Streets of rage 1,2,3.
Anyway, its due to the very fond memories that i have of my megadrive that keeps it as my all time fave console (Although the 360 is starting to gain ground)
Reasons i loved my Megadrive................
Sonic 1, 2 ,3 & Knuckles
Streets of rage 1,2 & 3
Outrun
Castle of illusion starring micky mouse
Golden axe
Road rash
Altered beast
Toejam and earl
Mortal kombat 1,2 & 3 (during the height of mortal kombats popularity)
Street fighter championship edition and Super street fighter 2
Comix zone
Shinobi III: Return of the ninja master & Revernge of shinobi
and many many more.......................
To be this good takes............ AGES
