SUMMARY: Having seen snippets of the PC version, I can definitely say that the Playstation version of Diablo fails to capture the impressiveness of the original, but that's not to say it doesn't have its up side.
Firstly, though it can get somewhat dull and depressing, the dreary gray atmosphere does seem to fit the overall mood of the game, and after awhile, they thankfully switch it up with some more colorfully red environments when you get to more hellish levels.
However, the limited variety of these environments can leave a player feeling a bit bored or claustrophobic. There's the town, and then maybe four or five different types of dungeon styles as you progress deeper and deeper underground. This is why I tend to rate Darkstone, a similar game as far as basic play setup goes, higher on enjoyability, because they at least have different lands and mini-villages in addition to individual dungeon...
While its counterpart on the PC boasts some pretty intense and fast moving visuals, Diablo for the PSX falls short in several different categories. The first of this being the actual speed of the game, it's a mess in terms of trying to figure out just what direction you're facing. You may think that this is a game play problem, but once you step into the dungeon, your character looks like he/she is walking around with something stuck where it shouldn't be.
The next major problem is the amount of detail in the game there is just barely any. The characters have no real definition, and enemies that you face have a tendency to blend in together, so there isn't a real way to tell just what you're attacking and killing. Most of the weapons look the same, as do the shields and armor. However, just like its PC counterpart, it does allow you to see some character changes depending on what type of armor or weapon that you're using.