This opener for the Phantom Pain is top notch, but as others have said, if you just want to do the main mission. It will only take about 2 to 3 hours of gameplay if you don't look up a walkthrough but are atleast decent at video games, if you are really good you can complete the mission in half an hour on S rank with pre planning.

Now of course, you are wondering why I have 23 hours (or more) on my account for this game if it only took me 2 hours to complete the main mission. That is because the Main mission is actually just a small part of the package on offer. And it is fun and worthwhile to 100% this game to carry over some bonuses to the main game and get compitent with the gameplay flow before you are dropped into a big open world.

Each mission can also be completed in multiple ways without losing that precious S on your report screen, and have
different benifets for each order the objectives can be completed. You also have a about 20 or so collectables in the form of xof badges and casset tapes to find, as well unlocking weapons for each letter grade that can help with acheiving S rank on a mission or for a hard mode playthrough. There is also trials you can complete for each mission.

This game however, is not worth its price, atleast if you get it by itself. I purchased the Definitive Experience bundle, which includes both Ground Zeros and the Phantom Pain, along with all of the dlc that came out for the latter. Since that Phantom Pain is easily worth the 20$ it is priced at. That puts this experience at 10$, and that is a much easier price to swallow for the type of gameplay. Since they are two parts of a complete story, there is not that much of a point to buy them seperatly unless you got one of them for free. But you will not regret playing both in order.

All in All, I reccomend this game, but only if you buy it as part of the Definitive Experience, or wait for atleast 50% off during a sale. But other than that, this is still a great game to have as part of your steam library. Now if only they would remaster MGS4.