This game isn't for everyone. If you play on easy and just run through the missions and fast travel everywhere, you will get bored fast. Chasing high levels won't get you anything special. This is a Ghost Recon game and players who are familiar with the traditional Ghost Recon formula will appreciate what this game has to offer.
You can spend a few days doing recon on a mission before actually tackling it. You can study the daily activity and patrol routes of a camp and devise a plan accordingly. You can decide to engage at night or during the day based on your recon findings. This game has a huge stealth design that is not forced but is rewarded. You don't have to play it this way which is why the game offers crazy vehicles and weapons for a an all out assault approach, but I feel it was designed with the traditional Ghost Recon formula in mind.