I got an idea to discuss this while thinking about the computer I have. It's not bad, but my graphics card is bringing it down. It's a Radeon X1200 128mb, known by me as one of the worst graphics cards. Anybody think they can top that?
The Graphics card which are not made by ATI and Nvidia are pretty bad for gaming and intensive tasks like HD video playback since they sometimes don't have the speed and features needed for gaming.
S3, and Matrox are two companies I would possibly never buy GPU froms.
I also dislike integrated graphics card made by Intel, S3, and most other brands which are built-in to the motherboard since they sometimes slow down when playing HD video and most modern games.
I currently have a Radeon 6770 which I like very much, but the worst video card I've ever had is the GeForce 5200. It was ridiculously hit and miss. Some games would run very well, and some would run frame by frame. I wasn't sad to get rid of it.