Well you get free online play.
You get pretty darn cool original PlayStation Network games (such as Calling All Cars, Super Stardust HD [ok not soooo original], PixelJunk Monster, etc).
You got pretty decent games such as Resistance (I'm actually still playing it online, even more than CoD4), MotorStorm (loading times online suck!), Warhawk (you fly, you drive, you run, can't get better than that), Heavenly Sword (while yes, it's a "button-smasher," I guess, it has a pretty good story to follow), Ratchet and Clank Future: Tools of Destruction (I've heard it's a great game, it's the next one I'm buying) and my favorite of all Uncharted: Drake's Fortune.
May I mention that Uncharted has ZERO loading screens after the inital boot up of the game? You can skip cut scenes, you can dies as many times as you want, you can do anything and it'll NEVER load again (unless you restart the game/PS3?) Amazing. Oh and the story is one of the best.
You also get a Blu-ray player to enjoy your movies in HD (although, I must advise you to get surround sound, Planet Earth in HD and SS = freaking awesome!)