I always told the open-world was useless, and also GZ was better than MGSV. But the level design is not shit as you wrote, sorry. It's still an extremely good game, gameplay wise. Story is crap? Yeah. The open-world is useless? Yeah. Chopper breaks immersion? Sure.
But the game is not crap. It's not a masterpiece, still it's the best stealth game you can find at the moment. GZ was better, eah, but was also a 10 hours experience at the best.
Also who is the one praising MGS2? that's my least favourite MGS ever. Like, I only like the Snake part which is 15 minutes and Snake Tales. A full game located on a plant which is all the same plus the worse ending you can imagine. It misses teletubbies, they were almost included into Peace Walker plot but Kojima didn't manage to get the license.