I've never been one to care much about a game's graphics. I didn't mind how Deus Ex, Metal Gear Solid or Half-Life looked when I played them for the first time rather recently and I currently play games on an SDTV, never having really experienced what it's like to play in HD. 
 
That said, playing Devil May Cry for the first time has made me realize that I've never experienced a game that I felt had truly aged badly. I've put 5 hours into the game—I'm at Mission 18—and I'm forcing myself to finish it. The controls are clunky as hell, mainly because of the camera that the player has absolutely no control over. This makes for frustrating platforming and combat (as it is difficult to perform a roll with Dante instead of jumping when you need to dodge quickly). Minor issues such as menu navigation and voice acting also make for an unpleasant ordeal, but the controls are really what make the game awful today.  
 
The game's also not easy, which kind of took me by surprise when I started playing.