my top five of all time:
1. MGS 1 to 3- excellent story,good plot,soundtrack,you could really feel the ``tatical espionage´´ word in the game,this game tought me how to think and improvise before shooting.
2. Devil May Cry 1 to 4- Sick soundtrack,story,game mechanics with lightning speed inputs at high level,the characters skills variations are endless if you're creative enuff
3. Prince of Persia(warrior within,the two towers)-this baby taught me how to beat any single player game,made me see that puzzles in a game are definition of challenge.
4. Splinter Cell(all but my favorite is Double Agent and Blacklist)- Espionage at its finest,patience,skill,improvisation,timing,team up,etc,etc...next to MGS this game make me feel like a Jason Bourne.
5. Resident Evil-alltough the essence of ``survival and horror´´ of the game faded away,it was my favorite survival game till code veronica back in the days.