Guys, there is a big difference between low resolution drawings and pixel art. Pixel art is done, well, pixel by pixel, but a lot of examples in this thread are basically subsampled drawings. Almost all pc games were just low resolution, not really made with a grid of pixels in mind, like new games were. That MegaMan game clearly was made with drawing tools similar to paint, not really pixel art.
Besides, some of the games looks to high resolution to be even called pixel art, specially these fighting games.
Besides, some of the games looks to high resolution to be even called pixel art, specially these fighting games.