I use steak sauce & worcestershire sauce & parsley. That's usually what I marinate my steaks in. They always come out tasting REALLY good.

I try out the different sauces in grocery stores as marinades but still, nothing can beat the taste fo soy sauce and lemon juice for me.

Same here, soy sauce and lemon juice or calamansi juice for my tagalog beef steak. But for the "real" steak, I like them rubbed with garlic and fried in butter.

We smoked two briskets the other day and marinated one in orange juice and the other in beer. The OJ one was excellent, the beer one was only OK but not terrific.

I have also used dry rubs with good success. I bought one at Williams Sonoma that I really liked but I think it was only black pepper, mustard, garlic, salt, and 1-2 other things. It would have been very easy to make at home, but I was rushed so I just bought it. It worked great.

Usually just with salt and black pepper. I do not want any marinate to overwhelm the flavor of my beef steak! Sometimes I add a bit of barbecue sauce during the grilling.