The Yashica 300 Autofocus appears to be a capable consumer film SLR for its era rather than a particularly specialized camera. From user experience shared here, it was well made, durable, and offered useful features such as auto metering and autofocus with manual override. Autofocus was said to be reasonably fast in good light, but less reliable at night even with its infrared assist, and its centered autofocus behavior could be limiting.

Like most film SLRs, it isn’t inherently better for black-and-white than color; that depends more on the film you load and the lens you use than on the body itself. Its suitability for portraits, landscapes, or general photography will mostly come down to the lens mounted on it.

A practical advantage today is that lenses for the system appear to be inexpensive. If the camera works properly, it should be a perfectly usable entry into 35mm film photography. The simplest advice is to test it with a roll of film and judge from the results, since condition matters more than old reviews for a camera of this age.