I'd rather play the actual game than the one on their site... Besides, id software is just a label now that Bethesda hides behind. The id developers quit soon after the Bethesda buyout, scattering across the globe to find better companies to work for.
My thoughts on the games Patricio listed that I have played:
Civ IV - I played it, and the game is fun, that is until you get into the later levels in which case it just becomes (literally) a race to the finish (set time), and not an elimination.
Magicka - Holy hell... If you have a computer that can pull a 2009 game on highest settings, GET THIS! This game is boring alone (like many games) but with a friend, or two, or three, it's more fun than doing your favorite thing in the whole world! There's so many magic combos, so many spells to go through, and even when you beat the game, there's still the DLC missions which are near IMPOSSIBLE to beat alone or with just one other person! It's a must buy and a must play with friends game, even if they're going to accidentally cross the beams and kill both of you.
Deus Ex: HR - Okay, so we all know that the first Deus Ex was possibly the most immersive and incredible game ever made, right? Well, this is basically the continuation of that amazing series. I've played through the game twice, just to get everything done (not achievement-wise). The game may seem a bit short when you know where everything is and what all the door codes are, but beating the game just once isn't enough. There's multiple ways to beat the missions, and getting the sneak achievement is extremely difficult since it has to be the whole game (yes, that means the ending too) other than the bosses. It's not so much FPS as it is just being stealthy and using everything available to you to advance without being caught. OR, you can take the alternative route, and beef yourself up so much that you can just walk through everything with your guns blazin'. I haven't gotten to play the DLC, but the game is amazing and should be played, even if you didn't play the first one. (Note: Invisible War didn't exist.)