This was good.
For as streamlined the controls are (compared to MGS3, the last/only MGS I've played), there's little hand-holding. The AI notices you when it makes sense. Nothing is really automated; there are no "crawl under building" or "hide in cover"buttons. the game leaves you with a lot of control and you keep that control at all times.
I think of stealth in recent games like Deus Ex: Human Revolution where the "stealth paths" are really quite safe. There's a clearly defined path and as long as you're snapped cover, the patrolling guards won't see you. in GZ, there are still paths, but less obvious ones, sort of how I remember MGS3 to be. You've got to constantly make sure you're fully hidden and you're often vulnerable from a few angles. It's just nice to actually be sneaking through a base rather than just finding the start of an obvious "stealth path" then zip on through.
Recordings were used well since they sounded believable. Chico's tapes didn't only contain pertinent information, same with Paz's diary. Chico's tapes are full of dead air/ambient sound and the important information (sound of gate opening, flag flapping) is all stuff you have to pick up on your own. They just sound like... actual recordings; what these moments would sound like if you just hit record. Compare the recordings from other games where every one is entirely and directly tied to the main story/situation, even if they're personal diaries. Here, you get some genuine insight into Paz's character from listening to her diary entries. By having something other than her beliefs/internal conflicts being explicitly described, it paints a more complete picture of the overall story/game world.
The final cutscene being in "real time" is refreshing too. like the gameplay, they're not fragmented. i found that helped keep me in the moment and let certain scenes really sink in for me as they sunk in for the characters.
It took me two hours to complete the two main objectives. This game is proof to me that placing such importance on amount of time (particularly how much is required to complete the main campaign/storyline/objective) is pointless. Not only was a lot about those two hours great, but there's plenty of content available outside the main story. Just listening to all the (well done) recordings is interesting. $20-$30 for this is reasonable considering the quality. Really glad to get back into MGS after so long and to see that it's still good.