They compare to more traditional roses like instant coffee compares to real coffee. They are too easy and cheesy. However, even instant coffee can be rather good as long it is not expected to taste like the real thing. Likewise, carpet roses do not produce big and fancy flowers on long stems for cutting, but they have other attributes that are advantageous in the landscape.
The small but ridiculously abundant roses that started blooming late last spring are only now finishing. Bloom can be white, pink, red, coral, scarlet, gold (orangish yellow), yellow or white. The rich green foliage is remarkably resistant to disease, and lasts until frost. The arching stems can spread a few feet without getting much more than three feet tall. Most cultivars stay shorter. Some get quite wide.
Like other roses, carpet roses will need to be pruned back severely while dormant in late winter. Yet, they do not need to be pruned nearly as carefully. Because they grow as thickets of canes, they do not need to be thinned to only a few canes when pruned. Even if old canes do not get pruned out, they will get overwhelmed and replaced by newer canes naturally.