i don't know about the top 5 video games i've ever played. i'm not hugely experienced with video games. i know that my favorite video game of all time is Tony Hawk's Underground 2.
i love the Atari classics Demonds to Diamonds, Breakout, Pong and Kaboom.
On the 1st Nintendo i was in love with Bubble Bobble, 3D World Runner, Paperboy and some motercycle (i think) game
My favorite N-64 game wa Mario Kart
and for Playstation2 i already mention THUG2, but i also highly enjoy Tony Hawk's American Wasteland, Grand Theft Auto 3 (its the only grand theft i have played) and State of Emergency.
My X-mas Wish List however has about 7 video games on it, so i will list the top 5 i want most.
2. Marvel Ultimate Alliance
3. Playboy: The Mansion
4. Taito Legends
5. Grand Theft Auto: San Andreas