This collection should be a part of everyone's PS2 library. It is one of the pinacle series of the Playstation system.
However, although these are great games, there are flaws that come with this collection. For starters, the original Metal Gear Solid is the original Playstation version. It was not updated to the PS2. So if you intend to play the original, you need to ahve an original Playsation Memroy card. It sucks, considering this game was updated for the Gamecube some time ago, so it makes you wonder why they didn't do it for this collection.
Secondly, the collection is not a total collection. Both MGS 2: Substance and MGS 3: Subsistence are missing the bonus discs that were packaged with the original games. All you get is what's on the original game discs. If you want the other bonus features, you'd have to buy the games seperately. However, it's a small flaw compared to what you get out of the core games themselves.
Issues aside, The Metal Gear Solid: Essential Collection is perfect for anyone who owns a PS2. It is one of the pinacle series to grace this system, and gamers owe it to themselves to give these games a shot. You won't be disappointed.