The key to great steak is the cut, (Delmonico or what is now called Rib Eye), the marinade, (I have a secret recipe, and it must be overnight in the fridge), the rub, (spices which again are a family secret), and the wood it's grilled over ... my favorite is mesquite. Add sauteed mushrooms, my special double-stuffed baked potatoes, grilled zuchini and summer squash, (or corn-on-the-cob), and the proper vino, and it's the perfect meal. 
I've always thought marinade and strong seasoning with steak is a lot like make-up on women. A real decent cut should be able to stand alone without too much..maybe a little salt and pepper, but thats it.
Lesser cuts might feel a little insecure and go a little zany with the eye-liner.
We are definitely on the same plane here, because I was going to say the same thing. I think there are cuts that work well with marinades (skirt, flank, and some of the cheaper, less "beefy" cuts), but I would never marinade a good ribeye, NY strip, T bone, etc. I think the amount of seasoning should be inversely proportionate to the quality of the cut.
I also feel the same way about sauces (although I make an exception if I am in a good french restaurant). Once you start getting into those high end cuts, putting sauce on it, is akin to throwing away your money