Wife and I were excited but a bit let down. The entry and ticket process is crowded anf long. They group entry by time but it is far too many people inside at once to enjoy. We both felt overcrowded and claustrophobic, this was the only time in a week in Rome. The paintings and sculpture are pretty but the place is so over decorated its hard to enjoy.
Try to go at an off time to avoid crowds so you can enjoy the art at your own pace.