They improved it significantly since launch. I found myself loving the added features more than expected, like the Screenplay and Master Books they included.
I also loved the full videos of the digital graphic novels, and variants of MGS1, like the Japanese version and Special Missions, all in one place.
And on the PC versions, there’s a good amount of relatively easily installed mods on Nexus that can add a lot of value.
I pretty much replay most of the Metal Gear games every other year or so, so it was just another excuse to replay again on a new platform.