Metroid Prime, definitely. It best captures the spirit of the older Metroid games, but in a way that's perfectly modern. The sense of isolation and of free exploration is most prominent there. Despite the fact that the three games are basically the same in that you have to tackle them in the same order, Metroid Prime is the only one where you *feel* like you're in control. It doesn't feel as structured as the other games (which have a very methodical pattern of come to an area, figure out how to gain access to the boss's area, do it, and move on). Metroid Prime is basically the same way, but it doesn't have those big, blinking billboards that say "THE BOSS IS HERE," like Prime 2 (with the Temples and Dark Temples), and Prime 3 (with it's Phazon Meteors) do.
Objectively, there isn't much difference between the three, but Prime brings everything together the best.
Monster Hunter: pissing me off since 2010.
