I have never been to one of those places, but judging from the reviews on TripAdvisor they are so expensive and aimed at tourists, that I don't even dare to.
We have a nice parilla in San Isidro, basically worth only during the weekend when they have more cuts available. Decent price (around 200/250 ARS/each with wine), accept credit cards.
Anything that is not meat is not for a good meal, but they make their own bread (one type, but a real pan de campo) and you have buffet cold salads when buying a meat plate. Chimichurri extremely good, salsa verde (also very good) and salsa criolla (ordinary) available.
I think these kind of parrillas de barrio are the best ones.