LOL, hey man. I would say it is easily worth buying. Now, I have never played LIVE, but the thing I love about this game is the level of detail you have over your franchise, the way you can customize your plays, the graphics are the best on the market, gameplay is silky smooth. From what I have heard about LIVE, people say it's more arcade-like rather than a true simulation of the sport. ESPN is basketball, pure and simple. Pure simulation.
My fav thing about it though, is the amount of aweseom competition on XBOX LIVE, ima lways ont here playing against others, it's really addicting. I say get it, its only 20 bucks so even if by some chance you don't like it (which you would be crazy not to 😉 ) it wouldn't be a huge loss or anything.
good luck and have fun!