Disclaimer: I played an English patch version of Rockman X. DIalogues and bosses names are based on the japanese script.

Still one of the best games in the franchise. Pretty much untouchable when it comes to OST and pacing. Plot-wise, it's quite simple, much like a classic Mega Man game.
The intro stage in this game is possibly one of my favorites in the franchise, and when you get the dash the game becomes a complete different beast than classic Mega Man. Faster pacing, tighter jumps, trickier dodges... you name it.
It's one of my favorite X games, though I do feel some of the later games improve on it a lot.