I think service was fine. The place is huge and nice (if you want to talk don´t go on weekends, there is loud live music). Great if you go with kids, its child friendly.
Tipical dishes look ok. We order schrimps (chicharon and picante) It was a dissapointment. Too expensive for the quality. I would say for 43 Soles you can get better deals at other restaurants. I think maybe scrhimps are not Montonero´s specialiy.