"My daughter (4) picked this after I helped narrow the choices down. This was her first non-Duplo Lego set, although, she's been exposed to mini-figs and other random Lego parts in the past. She chose this set over a construction set because it had more minifigs.
Her manual dexterity wasn't quite to the task of putting many of the smaller pieces together since the alignment of bricks needs higher precision than Duplo. This led to some moments where attempting to add one brick would dismantle another part or would just require me to step in a do the final pressing of pieces together.
It took a bit to get her to follow the directions, but as we went further through the instructions, she was understanding the way things went together better. Having steps broken into small tasks (and numbered bags) worked well, especially spreading the minifig build through the rest of the instructions. Since the minifigs were initially her primary focus, having that spread out helped keep her focused on building the parts of the set.
We play with this set daily, mostly playing out various scenarios with the minifigs. Picking up and replacing the red phone in the "bat cave" inevitably leads to the back wall getting knocked off, but she's become fairly expert in repairing the structures and vehicles. The Bat disc shooting thing could've been left out. It's just asking for problems. We've change it just to be carousel for the minifigs, with the discs used as decoration elsewhere.
Unless you are meticulous about tracking all the small parts, they will get lost. We've lost some bits off of Lex's vehicle, but so far my daughter doesn't seem to mind.
Overall a far easier introduction to Legos than I had as a kid."