1994
That was the year I got to enjoy 16 bit gaming at its fullest. Games like Final Fantasy 3, Super Metroid, Lunar 2, Snatcher and Samurai Shodown 2 (MVS at arcade). What a great year, especially when you own a SNES. This year just seemed to roll out with great games left and right for the Genesis/Sega CD and SNES. This was when arcade games were at their best for 2d. Well atleast up to 96 or so, but 94 was when arcade games just got really good.
My other picks would be 1990-92 for NES gaming at its best. As well as me owning my TG-16.
Then 1997 for owning my first Neo Geo. Also, PS1 and Saturn games were getting damn good.
2001 was also great for next gen gaming with the RE remake on Gamecube and Metal Gear Solid 2. This is when good polygons made my jaw drop once in a while.