Necropolis is a game of alternating frustration and boredom, with a few moments of energetic fun sneaking in on occasion.
BioShock, as the oldest title, obviously gets the biggest update as part of this collection. That said, despite being a nine-year-old game BioShock's graphics hold up surprisingly well, especially on PC.
Battleship is actually cheaper than most physical versions of the game, minus the various travel-sized editions, so it makes a nice introduction to the game if you have never had the opportunity to play it.
Abzû is an experience from start to finish, and one that is fairly unique among games. Every person who plays it is going to come away with something slightly different.