It's funny, there's loads of posts about this place, just not in its own thread: but Argentine, Steak, Wrigleyville, BYOB, Sheeple... all terms that will find you posts on Tango Sur.
I was looking for reasonable-priced steak (Thing2's request for his birthday), in a reasonable drive from his Loyola apartment, and TS fit the bill. Prices are higher than reported in a thread from last year (items such as Vacio for one are $19, not $13, but that thread said they were quoting an old price).
We split the beef, chicken and spinach empanadas. Nicely crisp, rich fillings, chimmichuri is a great accompaniment.
Salads are minimalist: some leaf lettuce and large slices of tomato and onion with oil and vinegar provided.
But you're here for a major beef application: Thing2 got the Bife Vesuvio: stuffed with spinach and cheese with the oil/garlic vesuvio treatment (not sure how different that is from the little container of chimmichuri it came with, but whatever). He loved it.
SueF had the boneless strip. It came out blue, but they re-fired it and it was fine, but had a large amount of fat on the edges. My Entrana (outer skirt) had similar problems: it should have been trimmed a little better, there was a lot of unchewable membrane on the outside.
Portions are enormous: all three of us took home leftovers (Sue and I about half, about a quarter for my son).
Service on the other hand is spotty: we were asked if we wanted more bread, but it never appeared until we asked again (twice). The place is VERY noisy, both from crowd and music (it didn't help that we were seated right under a wall-mounted subwoofer -- had I realized I might have requested a different table).
I would go back again (maybe with earplugs), it's a good value, but they could use a little polish, for a place that's been around for a while. They certainly are doing plenty of business, being full-up on a Sunday night.
What is patriotism, but the love of good things we ate in our childhood?
-- Lin Yutang