I really enjoyed it. As WK says, the control and motion is fluid and both the stealth and combat are really tight and sharp experiences. Definitely got me hyped for MGS V. I wasn't really interested before as MGS4 was a disappointment to me after the masterpiece that was 3, but I've gone and pre-ordered it (I know, I know!)

Is it worth the price? I didn't pay a bean, so yes! I haven't played through all the missions yet though. I think given that TPP is coming out with the same gameplay and a full game it's not really worth what some people have played for it.