While now on several noxious weed lists, it is a boon to wildlife, providing small mammals and song birds with safe nest sites as well as food. My local herd of white tail deer browse these shrubs almost all year around. I've read that it should be given some credit for the northward extension of the wintering range of many song birds in the past century. Individual flowers are not showy, but they are born in racemes and great profusion. Unfortunately, they are not fragrant, despite anything to the contrary that you might read.
New foliage is attractive, often red outlined, on well-armed stems.
These plants can be either shrubs or climbers. In parts of my woods, they are small, thin, lax and weak from too much shade. Since they root if the stems touch ground, as well as seed copiously and send up shoots from shallow roots, they quickly form virtually impenetrable thickets if they get enough sun to be robust. Those on the multiflora rose are one of the keys to identifying it because the margins are feathery or comb-like. A modified stem, always originating at a node, with nodes and internodes along the length of the thorn.