Yes. A macro lens can be very useful beyond macro photography. Most macro lenses are optically strong, very sharp, and often have low distortion, so they can work well for food, products, landscapes, and even general photography.

For portraits, the main consideration is focal length and rendering rather than the fact that it is a macro lens. Many macro lenses in portrait-friendly focal lengths can work very well, though their high sharpness may reveal more skin detail than some people want.

Advantages of a macro lens include close-focusing ability, excellent sharpness, and versatility if you want to switch between normal subjects and close-up detail shots.

Possible drawbacks are that some macro lenses have smaller maximum apertures than fast portrait lenses, autofocus may be optimized more for close-focus precision than speed, and the lens may cost or weigh more than a non-macro alternative.

So the answer is yes: a macro lens is often useful for non-macro scenes, but whether it is the best choice depends on focal length, aperture, autofocus behavior, and your subject.