I saw all the "BEST OVERALL THREADS", but honestly the only series I really like debating best game is Metroid. It's always good times. So what is your favorite Metroid game? Which one has the best gameplay, most unique. What is the worst Metroid? Which ones haven't you played? Do you prefer the 3D metroids or the 2D ones?
For me, and I know I will recieve flak, it's Metroid Prime 2. I really liked the atmosphere, the enemies, and the dark world. The game managed to feel really isolated, and have it's own unique vibe that Prime 1 didn't. Prime 2 is where Retro made "their"Metroid game instead of Super Metroid in 3D. I really liked the game overall. It was beautiful, had some sweet puzzles, had a unique vibe, and dat soundtrack.
Close second is Super Metroid, it's a classic of course.