Some climbs also have one to three stars associated with them. These represent how enjoyable the climb is and are by nature fairly subjective. They do, however, help narrow down which climbs are the most enjoyable to do. Please note that the very nature of waterfall ice implies that climbs are far more dynamic than rock climbs. The person who follows you on a climb may actually have a very different experience even as they follow the same line.
Grades also depend dramatically upon conditions.
For example, in thin conditions climbs may vary in difficulty by as much as a full grade from their normal formation. Likewise the grade is for the main line up the route. It is possible to do variations on a route that increase the difficulty a great deal. Significant variations are usually given their own write-up and occasionally their own name. You should realize that grades are not a replacement for your own knowledge of ice features and your own abilities.