Experimental Frenzy is deceptively strong, and I'm very excited about this card. You'll want it to be the one of the last cards cast from your hand, of course, since you won't be able to play other cards in your hand, but it then has the potential to allow you to play many cards each turn. Since it says you may "play" the top card of your library, and not "cast" the top card of your library, you're able to play a land from your library as well.
This means that each turn you should effectively be able to not only hit your land drop but play each other card until you reveal a second land since you won't be able to play two lands in a turn. When you go to your next turn you will draw the land on top of your deck and proceed to play cards until you reveal your second land again. It won't matter that you can't play the card in your hand since it will be a land and you're hitting land drops anyway.
Yes, there will certainly be turns where you don't have enough mana to cast the couple spells before you find your second land, and that you may have to draw a spell you otherwise wanted to cast, but over the long run, you'll be playing more than two cards on average over each of your turns with Experimental Frenzy on the battlefield, allowing you to out-grind midrange and control decks. I think this is another card that's under-the-radar now, but when people start playing with it, they'll realize its power level.