Mortal kombat is one of the most iconic games, but which was your favorite? Take any aspect you want: graphics, characters, the time spent with your friends, fatalities, etc.
MK 10 and 11 are definitely the best in terms of fighting mechanics, graphic and storyline. Armageddon has the best konquest mode (Shaolin Monk style) and spent a lot of time trying to max out the custom Fatality.
My overall favorite is MK: Deception. Konquest mode expanded the lore by exploring new realms and characters. Chess & Puzzle combat mini-games were fun. With a total of 26 characters each with 2 fatalities and a hara-kiri I spent a lot of time watching those.