This set does an excellent job of creating ruined walls with many shapes and effects. The best part is the extreme amount of customizability of the set. There are several textures to choose from (concrete, brick, stone of various colors), then a few effects (smoke, bullet damage, etc). With all the shapes, textures and effects, there are many ruined wall combinations. Additionally, all the top-bottom pieces are interchangable for even more variety.
I would say that this set only requires beginning cardstock modelling skills. One tip: to make sure the front-back edges match in the finished product, I cut the piece out with some margin, fold, glue, then trim to the marked lines. Exactly cutting the piece first often results in mismatched front-back pieces that does not look as good and requires more black-lining work to hide the white cut marks.
Overall, this kit is a great buy for it ease of building, number of combinations, good graphics and basic game utility. I would highly recommend also getting the matching #2 kit with this one for more variety.