What's bad: The Atari's graphics are among the least detailed of all home versions of Dig Dug. Characters are monochromatic, and bonus veggies are often abstract to the point of being unrecognizable.
What's good: Everything else.
Once you get past the graphics, there is absolutely nothing wrong or missing in this Dig Dug. Actually the background theme is a little abbreviated, but other than that, the arcade experience has been almost perfectly recreated. The Commodore 64 version may look nicer, but this one is far better in every other respect.
(Note: The Atari 5200 and the Atari 8-bit computers have very similar hardware, and games were often published with the same code for both. Except for the 5200's analog controls and some very small differences in graphics, Dig-Dug looks and plays the same on both platforms.)
Grade for both: A-