The infamous 10NES lockout chip, required for all NES cartridges.which led to the classic tactic of blowing into the system and/or games, which actually just exacerbated the situation by throwing more moisture onto the pins from the water vapor carried in one's breath. The fact that the pins were simple, ungilded copper and tarnished easily at exposure to moisture didn't help, and only intensified when NoA blamed dirty cartridges. With each cartridge insertion, the cheaply-made pins and frame were bent more and more until no contact could be established. This was further compounded by using rather substandard materials for the connector and its frame, making it susceptible to bending.Due to expenses, a "zero insertion force" mechanism was used (put a cart in, fix it with a lever) but said mechanism ended up putting great force on the pins in both cart and connector, bending them slightly more with each insertion and shoving the ROM board back into the cartridge. NoA's industrial designers made the console look like a VCR, adopting a VCR-like front-loading cartridge due to a combination of wanting to make the system look as little like a game console as possible and a desire to avoid players in drier areas of the America from accidentally shocking themselves and possibly damaging the system (as the original top-loading Famicom had a direct connection between the cartridge slot - which could very easily be touched on accident because of how close to the outside edge it was - and motherboard, compared to the front-loader's more roundabout circuitry and less accessible connector pins in the cartridge slot).So what was wrong with the NES-001? Well. While the Japanese version (HVC-001) is a remarkably solid piece of engineering that often continues to work over 25 years later, the American release (handled by Nintendo of America) was rather sloppily redesigned to distance itself from pre-Crash consoles due to many vendors refusing to stock anything even remotely resembling the console, fearing that they wouldn't sell. While the NES-001 is an iconic part of video game history, it's pretty badly designed. Yes, you could only do tile-based graphics with sprites, but at least they were good tile-based graphics. While this imposed limitations on developers that even Atari 2600 games didn't have to suffer under, it also freed them from having to deal with the minutiae of graphics. It only understands tiles, tilemaps, and sprites, and it implements them directly in the video output hardware.
The reason all NES games are tile-based is because that's what the NES hardware does the graphics system is a separate processor that has its own memory space for palettes and images. This is because every graphical element generated by the system is made up of 8x8 pixel blocks known as tiles. To a casual observer, the graphics for the NES may be seen as "blocky".
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