gameplay is the first and most important aspect in my opinion
i like games that are easy to learn hard to master, most of the times i don't care about graphics
and as a big rpg fan this is the genre i enjoy most specially Jrpg
i like games with 100+ hours gameplay
vast worlds to explore
interesting heroes (art background story)
so yea that is for me personally
some of my best games i played are
all Final Fantasy (excluding any FF on ps3)
Suikoden
most of the Zelda and the best one ocarina of time
Halo
Doom
resident evil
super mario 64
Banjo-Kazooie
goldeneye 64
World of Warcraft (what a game)
Skyrim
Oblivion
Toejam and earl (megadrive)
mortal combat 1+2
chrono trigger
Kingdom hearts
Half life
Earth worm Jim lolololol
and the list goes on of course
i don't like most of the modern games i don't know why but most of the are really boring form me