I'd like to give more stars, but I think I've been ruined by personal experience. I frequent Momocho so that's the benchmark for my El Carnicero visit.
The food is great, but menu selection is limited. Boar Nachos were fantastic, as were the different guacamoles. Drinks were really good, especially the spicy mango Margaritas.
The biggest issue was inconsistent service. Our table had lots of empty dishes and glasses that remained on our table from the beginning until we paid our bill. Our server was really personable, but she disappeared towards the end of our meal, especially when we were interested in after-dinner drinks and dessert. (FYI: they only have 1 dessert per night and it rotates. Not good if you crave fried ice cream, like my pregnant wife did. Things got ugly.)
El Carnicero is a great place for a midweek elevated meal. The food is great, but the service is just OK. Don't expect a full experience like Momocho. El Carn is like the gateway to the full ModMex Momocho experience. So, go for typical dining, and save Momocho for special occasions.